chore(deps): update dependency multer to v2 [security] - #55

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renovate/npm-multer-vulnerability
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chore(deps): update dependency multer to v2 [security]#55
renovate[bot] wants to merge 1 commit into
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renovate/npm-multer-vulnerability

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@renovaterenovateBot commented Apr 30, 2026•
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This PR contains the following updates:

PackageChangeAgeAdoptionPassingConfidence
multer1.4.2 → 2.2.0ageadoptionpassingconfidence

Multer vulnerable to Denial of Service via incomplete cleanup

CVE-2026-3304 / GHSA-xf7r-hgr6-v32p

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via resource exhaustion

CVE-2026-2359 / GHSA-v52c-386h-88mc

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer Vulnerable to Denial of Service via Uncontrolled Recursion

CVE-2026-3520 / GHSA-5528-5vmv-3xc2

More information

Details

Impact

A vulnerability in Multer versions < 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow.

Patches

Users should upgrade to 2.1.1

Workarounds

None

Resources

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via deeply nested field names

CVE-2026-5079 / GHSA-72gw-mp4g-v24j

More information

Details

Impact

Multer is vulnerable to a Denial of Service (DoS) via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names (e.g., a[b][c]) with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.

Patches

Users should upgrade to 2.2.0 and configure limits.fieldNestingDepth to the minimum depth their application requires.

Workarounds

Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.

Severity

  • CVSS Score: 7.5 / 10 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Release Notes

expressjs/multer (multer)

v2.2.0

Compare Source

v2.1.1

Compare Source

v2.1.0

Compare Source

v2.0.2

Compare Source

v2.0.1

Compare Source

v2.0.0

Compare Source

v1.4.4

Compare Source

v1.4.3

Compare Source

  • Bugfix: Avoid deprecated pseudoRandomBytes function (#​774)
  • Docs: Add Português Brazil translation for README (#​758)
  • Docs: Clarify the callback calling convention (#​775)
  • Docs: Add example on how to link to html multipart form (#​580)
  • Docs: Add Spanish translation for README (#​838)
  • Docs: Add Math.random() to storage filename example (#​841)
  • Docs: Fix mistakes in russian doc (#​869)
  • Docs: Improve Português Brazil translation (#​877)
  • Docs: Update var to const in all Readmes (#​1024)
  • Internal: Bump mkdirp version (#​862)
  • Internal: Bump Standard version (#​878)

Configuration

📅 Schedule: (UTC)

  • Branch creation
    • At any time (no schedule defined)
  • Automerge
    • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

  • If you want to rebase/retry this PR, check this box

This PR was generated by Mend Renovate. View the repository job log.

@renovate
renovateBotforce-pushed the renovate/npm-multer-vulnerability branch from c933948 to 9d634f6CompareJune 20, 2026 08:31
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all \u003cpre\u003e\u003ccode\u003e blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks"); } } catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); } })(); (function(){ try { var __m = "github.com"; var __re = new RegExp('^' + "github\\.com" + '
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chore(deps): update dependency multer to v2 [security] - #55

Open
renovate[bot] wants to merge 1 commit into
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renovate/npm-multer-vulnerability
Open

chore(deps): update dependency multer to v2 [security]#55
renovate[bot] wants to merge 1 commit into
masterfrom
renovate/npm-multer-vulnerability

Conversation

@renovate

@renovaterenovateBot commented Apr 30, 2026•
edited
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This PR contains the following updates:

PackageChangeAgeAdoptionPassingConfidence
multer1.4.2 → 2.2.0ageadoptionpassingconfidence

Multer vulnerable to Denial of Service via incomplete cleanup

CVE-2026-3304 / GHSA-xf7r-hgr6-v32p

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via resource exhaustion

CVE-2026-2359 / GHSA-v52c-386h-88mc

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer Vulnerable to Denial of Service via Uncontrolled Recursion

CVE-2026-3520 / GHSA-5528-5vmv-3xc2

More information

Details

Impact

A vulnerability in Multer versions < 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow.

Patches

Users should upgrade to 2.1.1

Workarounds

None

Resources

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via deeply nested field names

CVE-2026-5079 / GHSA-72gw-mp4g-v24j

More information

Details

Impact

Multer is vulnerable to a Denial of Service (DoS) via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names (e.g., a[b][c]) with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.

Patches

Users should upgrade to 2.2.0 and configure limits.fieldNestingDepth to the minimum depth their application requires.

Workarounds

Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.

Severity

  • CVSS Score: 7.5 / 10 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Release Notes

expressjs/multer (multer)

v2.2.0

Compare Source

v2.1.1

Compare Source

v2.1.0

Compare Source

v2.0.2

Compare Source

v2.0.1

Compare Source

v2.0.0

Compare Source

v1.4.4

Compare Source

v1.4.3

Compare Source

  • Bugfix: Avoid deprecated pseudoRandomBytes function (#​774)
  • Docs: Add Português Brazil translation for README (#​758)
  • Docs: Clarify the callback calling convention (#​775)
  • Docs: Add example on how to link to html multipart form (#​580)
  • Docs: Add Spanish translation for README (#​838)
  • Docs: Add Math.random() to storage filename example (#​841)
  • Docs: Fix mistakes in russian doc (#​869)
  • Docs: Improve Português Brazil translation (#​877)
  • Docs: Update var to const in all Readmes (#​1024)
  • Internal: Bump mkdirp version (#​862)
  • Internal: Bump Standard version (#​878)

Configuration

📅 Schedule: (UTC)

  • Branch creation
    • At any time (no schedule defined)
  • Automerge
    • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

  • If you want to rebase/retry this PR, check this box

This PR was generated by Mend Renovate. View the repository job log.

@renovate
renovateBotforce-pushed the renovate/npm-multer-vulnerability branch from c933948 to 9d634f6CompareJune 20, 2026 08:31
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0 participants

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix"); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

chore(deps): update dependency multer to v2 [security] - #55

Open
renovate[bot] wants to merge 1 commit into
masterfrom
renovate/npm-multer-vulnerability
Open

chore(deps): update dependency multer to v2 [security]#55
renovate[bot] wants to merge 1 commit into
masterfrom
renovate/npm-multer-vulnerability

Conversation

@renovate

@renovaterenovateBot commented Apr 30, 2026•
edited
Loading

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Contributor

This PR contains the following updates:

PackageChangeAgeAdoptionPassingConfidence
multer1.4.2 → 2.2.0ageadoptionpassingconfidence

Multer vulnerable to Denial of Service via incomplete cleanup

CVE-2026-3304 / GHSA-xf7r-hgr6-v32p

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via resource exhaustion

CVE-2026-2359 / GHSA-v52c-386h-88mc

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer Vulnerable to Denial of Service via Uncontrolled Recursion

CVE-2026-3520 / GHSA-5528-5vmv-3xc2

More information

Details

Impact

A vulnerability in Multer versions < 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow.

Patches

Users should upgrade to 2.1.1

Workarounds

None

Resources

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via deeply nested field names

CVE-2026-5079 / GHSA-72gw-mp4g-v24j

More information

Details

Impact

Multer is vulnerable to a Denial of Service (DoS) via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names (e.g., a[b][c]) with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.

Patches

Users should upgrade to 2.2.0 and configure limits.fieldNestingDepth to the minimum depth their application requires.

Workarounds

Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.

Severity

  • CVSS Score: 7.5 / 10 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Release Notes

expressjs/multer (multer)

v2.2.0

Compare Source

v2.1.1

Compare Source

v2.1.0

Compare Source

v2.0.2

Compare Source

v2.0.1

Compare Source

v2.0.0

Compare Source

v1.4.4

Compare Source

v1.4.3

Compare Source

  • Bugfix: Avoid deprecated pseudoRandomBytes function (#​774)
  • Docs: Add Português Brazil translation for README (#​758)
  • Docs: Clarify the callback calling convention (#​775)
  • Docs: Add example on how to link to html multipart form (#​580)
  • Docs: Add Spanish translation for README (#​838)
  • Docs: Add Math.random() to storage filename example (#​841)
  • Docs: Fix mistakes in russian doc (#​869)
  • Docs: Improve Português Brazil translation (#​877)
  • Docs: Update var to const in all Readmes (#​1024)
  • Internal: Bump mkdirp version (#​862)
  • Internal: Bump Standard version (#​878)

Configuration

📅 Schedule: (UTC)

  • Branch creation
    • At any time (no schedule defined)
  • Automerge
    • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

  • If you want to rebase/retry this PR, check this box

This PR was generated by Mend Renovate. View the repository job log.

@renovate
renovateBotforce-pushed the renovate/npm-multer-vulnerability branch from c933948 to 9d634f6CompareJune 20, 2026 08:31
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

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Milestone

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Development

Successfully merging this pull request may close these issues.

0 participants

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length \u003e 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms"); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

chore(deps): update dependency multer to v2 [security] - #55

Open
renovate[bot] wants to merge 1 commit into
masterfrom
renovate/npm-multer-vulnerability
Open

chore(deps): update dependency multer to v2 [security]#55
renovate[bot] wants to merge 1 commit into
masterfrom
renovate/npm-multer-vulnerability

Conversation

@renovate

@renovaterenovateBot commented Apr 30, 2026•
edited
Loading

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Contributor

This PR contains the following updates:

PackageChangeAgeAdoptionPassingConfidence
multer1.4.2 → 2.2.0ageadoptionpassingconfidence

Multer vulnerable to Denial of Service via incomplete cleanup

CVE-2026-3304 / GHSA-xf7r-hgr6-v32p

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via resource exhaustion

CVE-2026-2359 / GHSA-v52c-386h-88mc

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer Vulnerable to Denial of Service via Uncontrolled Recursion

CVE-2026-3520 / GHSA-5528-5vmv-3xc2

More information

Details

Impact

A vulnerability in Multer versions < 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow.

Patches

Users should upgrade to 2.1.1

Workarounds

None

Resources

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via deeply nested field names

CVE-2026-5079 / GHSA-72gw-mp4g-v24j

More information

Details

Impact

Multer is vulnerable to a Denial of Service (DoS) via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names (e.g., a[b][c]) with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.

Patches

Users should upgrade to 2.2.0 and configure limits.fieldNestingDepth to the minimum depth their application requires.

Workarounds

Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.

Severity

  • CVSS Score: 7.5 / 10 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Release Notes

expressjs/multer (multer)

v2.2.0

Compare Source

v2.1.1

Compare Source

v2.1.0

Compare Source

v2.0.2

Compare Source

v2.0.1

Compare Source

v2.0.0

Compare Source

v1.4.4

Compare Source

v1.4.3

Compare Source

  • Bugfix: Avoid deprecated pseudoRandomBytes function (#​774)
  • Docs: Add Português Brazil translation for README (#​758)
  • Docs: Clarify the callback calling convention (#​775)
  • Docs: Add example on how to link to html multipart form (#​580)
  • Docs: Add Spanish translation for README (#​838)
  • Docs: Add Math.random() to storage filename example (#​841)
  • Docs: Fix mistakes in russian doc (#​869)
  • Docs: Improve Português Brazil translation (#​877)
  • Docs: Update var to const in all Readmes (#​1024)
  • Internal: Bump mkdirp version (#​862)
  • Internal: Bump Standard version (#​878)

Configuration

📅 Schedule: (UTC)

  • Branch creation
    • At any time (no schedule defined)
  • Automerge
    • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

  • If you want to rebase/retry this PR, check this box

This PR was generated by Mend Renovate. View the repository job log.

@renovate
renovateBotforce-pushed the renovate/npm-multer-vulnerability branch from c933948 to 9d634f6CompareJune 20, 2026 08:31
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links"); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + '
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chore(deps): update dependency multer to v2 [security] - #55

Open
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Open

chore(deps): update dependency multer to v2 [security]#55
renovate[bot] wants to merge 1 commit into
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renovate/npm-multer-vulnerability

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@renovaterenovateBot commented Apr 30, 2026•
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This PR contains the following updates:

PackageChangeAgeAdoptionPassingConfidence
multer1.4.2 → 2.2.0ageadoptionpassingconfidence

Multer vulnerable to Denial of Service via incomplete cleanup

CVE-2026-3304 / GHSA-xf7r-hgr6-v32p

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via resource exhaustion

CVE-2026-2359 / GHSA-v52c-386h-88mc

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer Vulnerable to Denial of Service via Uncontrolled Recursion

CVE-2026-3520 / GHSA-5528-5vmv-3xc2

More information

Details

Impact

A vulnerability in Multer versions < 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow.

Patches

Users should upgrade to 2.1.1

Workarounds

None

Resources

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via deeply nested field names

CVE-2026-5079 / GHSA-72gw-mp4g-v24j

More information

Details

Impact

Multer is vulnerable to a Denial of Service (DoS) via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names (e.g., a[b][c]) with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.

Patches

Users should upgrade to 2.2.0 and configure limits.fieldNestingDepth to the minimum depth their application requires.

Workarounds

Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.

Severity

  • CVSS Score: 7.5 / 10 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Release Notes

expressjs/multer (multer)

v2.2.0

Compare Source

v2.1.1

Compare Source

v2.1.0

Compare Source

v2.0.2

Compare Source

v2.0.1

Compare Source

v2.0.0

Compare Source

v1.4.4

Compare Source

v1.4.3

Compare Source

  • Bugfix: Avoid deprecated pseudoRandomBytes function (#​774)
  • Docs: Add Português Brazil translation for README (#​758)
  • Docs: Clarify the callback calling convention (#​775)
  • Docs: Add example on how to link to html multipart form (#​580)
  • Docs: Add Spanish translation for README (#​838)
  • Docs: Add Math.random() to storage filename example (#​841)
  • Docs: Fix mistakes in russian doc (#​869)
  • Docs: Improve Português Brazil translation (#​877)
  • Docs: Update var to const in all Readmes (#​1024)
  • Internal: Bump mkdirp version (#​862)
  • Internal: Bump Standard version (#​878)

Configuration

📅 Schedule: (UTC)

  • Branch creation
    • At any time (no schedule defined)
  • Automerge
    • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

  • If you want to rebase/retry this PR, check this box

This PR was generated by Mend Renovate. View the repository job log.

@renovate
renovateBotforce-pushed the renovate/npm-multer-vulnerability branch from c933948 to 9d634f6CompareJune 20, 2026 08:31
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default"); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

chore(deps): update dependency multer to v2 [security] - #55

Open
renovate[bot] wants to merge 1 commit into
masterfrom
renovate/npm-multer-vulnerability
Open

chore(deps): update dependency multer to v2 [security]#55
renovate[bot] wants to merge 1 commit into
masterfrom
renovate/npm-multer-vulnerability

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@renovate

@renovaterenovateBot commented Apr 30, 2026•
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This PR contains the following updates:

PackageChangeAgeAdoptionPassingConfidence
multer1.4.2 → 2.2.0ageadoptionpassingconfidence

Multer vulnerable to Denial of Service via incomplete cleanup

CVE-2026-3304 / GHSA-xf7r-hgr6-v32p

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via resource exhaustion

CVE-2026-2359 / GHSA-v52c-386h-88mc

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer Vulnerable to Denial of Service via Uncontrolled Recursion

CVE-2026-3520 / GHSA-5528-5vmv-3xc2

More information

Details

Impact

A vulnerability in Multer versions < 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow.

Patches

Users should upgrade to 2.1.1

Workarounds

None

Resources

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via deeply nested field names

CVE-2026-5079 / GHSA-72gw-mp4g-v24j

More information

Details

Impact

Multer is vulnerable to a Denial of Service (DoS) via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names (e.g., a[b][c]) with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.

Patches

Users should upgrade to 2.2.0 and configure limits.fieldNestingDepth to the minimum depth their application requires.

Workarounds

Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.

Severity

  • CVSS Score: 7.5 / 10 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Release Notes

expressjs/multer (multer)

v2.2.0

Compare Source

v2.1.1

Compare Source

v2.1.0

Compare Source

v2.0.2

Compare Source

v2.0.1

Compare Source

v2.0.0

Compare Source

v1.4.4

Compare Source

v1.4.3

Compare Source

  • Bugfix: Avoid deprecated pseudoRandomBytes function (#​774)
  • Docs: Add Português Brazil translation for README (#​758)
  • Docs: Clarify the callback calling convention (#​775)
  • Docs: Add example on how to link to html multipart form (#​580)
  • Docs: Add Spanish translation for README (#​838)
  • Docs: Add Math.random() to storage filename example (#​841)
  • Docs: Fix mistakes in russian doc (#​869)
  • Docs: Improve Português Brazil translation (#​877)
  • Docs: Update var to const in all Readmes (#​1024)
  • Internal: Bump mkdirp version (#​862)
  • Internal: Bump Standard version (#​878)

Configuration

📅 Schedule: (UTC)

  • Branch creation
    • At any time (no schedule defined)
  • Automerge
    • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

  • If you want to rebase/retry this PR, check this box

This PR was generated by Mend Renovate. View the repository job log.

@renovate
renovateBotforce-pushed the renovate/npm-multer-vulnerability branch from c933948 to 9d634f6CompareJune 20, 2026 08:31
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

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No one assigned

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Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

0 participants

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers"); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

chore(deps): update dependency multer to v2 [security] - #55

Open
renovate[bot] wants to merge 1 commit into
masterfrom
renovate/npm-multer-vulnerability
Open

chore(deps): update dependency multer to v2 [security]#55
renovate[bot] wants to merge 1 commit into
masterfrom
renovate/npm-multer-vulnerability

Conversation

@renovate

@renovaterenovateBot commented Apr 30, 2026•
edited
Loading

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Contributor

This PR contains the following updates:

PackageChangeAgeAdoptionPassingConfidence
multer1.4.2 → 2.2.0ageadoptionpassingconfidence

Multer vulnerable to Denial of Service via incomplete cleanup

CVE-2026-3304 / GHSA-xf7r-hgr6-v32p

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via resource exhaustion

CVE-2026-2359 / GHSA-v52c-386h-88mc

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer Vulnerable to Denial of Service via Uncontrolled Recursion

CVE-2026-3520 / GHSA-5528-5vmv-3xc2

More information

Details

Impact

A vulnerability in Multer versions < 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow.

Patches

Users should upgrade to 2.1.1

Workarounds

None

Resources

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via deeply nested field names

CVE-2026-5079 / GHSA-72gw-mp4g-v24j

More information

Details

Impact

Multer is vulnerable to a Denial of Service (DoS) via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names (e.g., a[b][c]) with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.

Patches

Users should upgrade to 2.2.0 and configure limits.fieldNestingDepth to the minimum depth their application requires.

Workarounds

Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.

Severity

  • CVSS Score: 7.5 / 10 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Release Notes

expressjs/multer (multer)

v2.2.0

Compare Source

v2.1.1

Compare Source

v2.1.0

Compare Source

v2.0.2

Compare Source

v2.0.1

Compare Source

v2.0.0

Compare Source

v1.4.4

Compare Source

v1.4.3

Compare Source

  • Bugfix: Avoid deprecated pseudoRandomBytes function (#​774)
  • Docs: Add Português Brazil translation for README (#​758)
  • Docs: Clarify the callback calling convention (#​775)
  • Docs: Add example on how to link to html multipart form (#​580)
  • Docs: Add Spanish translation for README (#​838)
  • Docs: Add Math.random() to storage filename example (#​841)
  • Docs: Fix mistakes in russian doc (#​869)
  • Docs: Improve Português Brazil translation (#​877)
  • Docs: Update var to const in all Readmes (#​1024)
  • Internal: Bump mkdirp version (#​862)
  • Internal: Bump Standard version (#​878)

Configuration

📅 Schedule: (UTC)

  • Branch creation
    • At any time (no schedule defined)
  • Automerge
    • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

  • If you want to rebase/retry this PR, check this box

This PR was generated by Mend Renovate. View the repository job log.

@renovate
renovateBotforce-pushed the renovate/npm-multer-vulnerability branch from c933948 to 9d634f6CompareJune 20, 2026 08:31
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

No reviews

Assignees

No one assigned

Labels

None yet

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

0 participants

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode"); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })();
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chore(deps): update dependency multer to v2 [security] - #55

Open
renovate[bot] wants to merge 1 commit into
masterfrom
renovate/npm-multer-vulnerability
Open

chore(deps): update dependency multer to v2 [security]#55
renovate[bot] wants to merge 1 commit into
masterfrom
renovate/npm-multer-vulnerability

Conversation

@renovate

@renovaterenovateBot commented Apr 30, 2026•
edited
Loading

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Contributor

This PR contains the following updates:

PackageChangeAgeAdoptionPassingConfidence
multer1.4.2 → 2.2.0ageadoptionpassingconfidence

Multer vulnerable to Denial of Service via incomplete cleanup

CVE-2026-3304 / GHSA-xf7r-hgr6-v32p

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via resource exhaustion

CVE-2026-2359 / GHSA-v52c-386h-88mc

More information

Details

Impact

A vulnerability in Multer versions < 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion.

Patches

Users should upgrade to 2.1.0

Workarounds

None

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer Vulnerable to Denial of Service via Uncontrolled Recursion

CVE-2026-3520 / GHSA-5528-5vmv-3xc2

More information

Details

Impact

A vulnerability in Multer versions < 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow.

Patches

Users should upgrade to 2.1.1

Workarounds

None

Resources

Severity

  • CVSS Score: 8.7 / 10 (High)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Multer vulnerable to Denial of Service via deeply nested field names

CVE-2026-5079 / GHSA-72gw-mp4g-v24j

More information

Details

Impact

Multer is vulnerable to a Denial of Service (DoS) via deeply nested field names in multipart form data. The append-field dependency parses bracket notation in field names (e.g., a[b][c]) with no limit on nesting depth, allowing an attacker to force allocation of deeply nested object structures that consume CPU and memory. A single HTTP request with a crafted multipart body is sufficient to exploit this.

Patches

Users should upgrade to 2.2.0 and configure limits.fieldNestingDepth to the minimum depth their application requires.

Workarounds

Set limits.fields to a reasonable value to reduce the number of fields an attacker can send per request. This does not fully mitigate the issue but limits the impact.

Severity

  • CVSS Score: 7.5 / 10 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Release Notes

expressjs/multer (multer)

v2.2.0

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v2.1.1

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v2.1.0

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v2.0.2

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v2.0.1

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v2.0.0

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v1.4.4

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v1.4.3

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  • Bugfix: Avoid deprecated pseudoRandomBytes function (#​774)
  • Docs: Add Português Brazil translation for README (#​758)
  • Docs: Clarify the callback calling convention (#​775)
  • Docs: Add example on how to link to html multipart form (#​580)
  • Docs: Add Spanish translation for README (#​838)
  • Docs: Add Math.random() to storage filename example (#​841)
  • Docs: Fix mistakes in russian doc (#​869)
  • Docs: Improve Português Brazil translation (#​877)
  • Docs: Update var to const in all Readmes (#​1024)
  • Internal: Bump mkdirp version (#​862)
  • Internal: Bump Standard version (#​878)

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This PR was generated by Mend Renovate. View the repository job log.

@renovate
renovateBotforce-pushed the renovate/npm-multer-vulnerability branch from c933948 to 9d634f6CompareJune 20, 2026 08:31
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