RUSTSEC-2026-0258: h2 unbounded empty DATA frames #39

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Open
RUSTSEC-2026-0258: h2 unbounded empty DATA frames#39

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@github-actions
github-actions
bot
opened on Aug 19, 2026

h2 unbounded empty DATA frames

Details
Packageh2
Version0.3.27
URLGHSA-q83h-524g-xf6h
Date2026-08-17
Patched versions>=0.4.16

The h2 crate, used internally by hyper, had a flaw that would accept and queue empty DATA frames without limit.
If streams were not actively drained, this could lead to unbounded memory usage, or a panic if the length overflows.

Low severity.

Patched in v0.4.16.

See advisory page for additional details.

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      , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
       blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
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;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

      Skip to content
      RUSTSEC-2026-0258: h2 unbounded empty DATA frames #39
      Open
      Open
      RUSTSEC-2026-0258: h2 unbounded empty DATA frames#39
      Description
      @github-actions
      github-actions
      bot
      opened on Aug 19, 2026
      h2 unbounded empty DATA frames
      Details
      Packageh2
      Version0.3.27
      URLGHSA-q83h-524g-xf6h
      Date2026-08-17
      Patched versions>=0.4.16
      The h2 crate, used internally by hyper, had a flaw that would accept and queue empty DATA frames without limit.
      
If streams were not actively drained, this could lead to unbounded memory usage, or a panic if the length overflows.
      Low severity.
      Patched in v0.4.16.
      See advisory page for additional details.
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        No labels
        No labels
        Projects
        No projects
          Milestone
          No milestone
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          None yet
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          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

          Skip to content
          RUSTSEC-2026-0258: h2 unbounded empty DATA frames #39
          Open
          Open
          RUSTSEC-2026-0258: h2 unbounded empty DATA frames#39
          Description
          @github-actions
          github-actions
          bot
          opened on Aug 19, 2026
          h2 unbounded empty DATA frames
          Details
          Packageh2
          Version0.3.27
          URLGHSA-q83h-524g-xf6h
          Date2026-08-17
          Patched versions>=0.4.16
          The h2 crate, used internally by hyper, had a flaw that would accept and queue empty DATA frames without limit.
          
If streams were not actively drained, this could lead to unbounded memory usage, or a panic if the length overflows.
          Low severity.
          Patched in v0.4.16.
          See advisory page for additional details.
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            No labels
            No labels
            Projects
            No projects
              Milestone
              No milestone
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              None yet
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              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              RUSTSEC-2026-0258: h2 unbounded empty DATA frames #39
              Open
              Open
              RUSTSEC-2026-0258: h2 unbounded empty DATA frames#39
              Description
              @github-actions
              github-actions
              bot
              opened on Aug 19, 2026
              h2 unbounded empty DATA frames
              Details
              Packageh2
              Version0.3.27
              URLGHSA-q83h-524g-xf6h
              Date2026-08-17
              Patched versions>=0.4.16
              The h2 crate, used internally by hyper, had a flaw that would accept and queue empty DATA frames without limit.
              
If streams were not actively drained, this could lead to unbounded memory usage, or a panic if the length overflows.
              Low severity.
              Patched in v0.4.16.
              See advisory page for additional details.
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                No labels
                No labels
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
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                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

                  Skip to content
                  RUSTSEC-2026-0258: h2 unbounded empty DATA frames #39
                  Open
                  Open
                  RUSTSEC-2026-0258: h2 unbounded empty DATA frames#39
                  Description
                  @github-actions
                  github-actions
                  bot
                  opened on Aug 19, 2026
                  h2 unbounded empty DATA frames
                  Details
                  Packageh2
                  Version0.3.27
                  URLGHSA-q83h-524g-xf6h
                  Date2026-08-17
                  Patched versions>=0.4.16
                  The h2 crate, used internally by hyper, had a flaw that would accept and queue empty DATA frames without limit.
                  
If streams were not actively drained, this could lead to unbounded memory usage, or a panic if the length overflows.
                  Low severity.
                  Patched in v0.4.16.
                  See advisory page for additional details.
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    No labels
                    No labels
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                      Skip to content
                      RUSTSEC-2026-0258: h2 unbounded empty DATA frames #39
                      Open
                      Open
                      RUSTSEC-2026-0258: h2 unbounded empty DATA frames#39
                      Description
                      @github-actions
                      github-actions
                      bot
                      opened on Aug 19, 2026
                      h2 unbounded empty DATA frames
                      Details
                      Packageh2
                      Version0.3.27
                      URLGHSA-q83h-524g-xf6h
                      Date2026-08-17
                      Patched versions>=0.4.16
                      The h2 crate, used internally by hyper, had a flaw that would accept and queue empty DATA frames without limit.
                      
If streams were not actively drained, this could lead to unbounded memory usage, or a panic if the length overflows.
                      Low severity.
                      Patched in v0.4.16.
                      See advisory page for additional details.
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        No labels
                        No labels
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                          Skip to content
                          RUSTSEC-2026-0258: h2 unbounded empty DATA frames #39
                          Open
                          Open
                          RUSTSEC-2026-0258: h2 unbounded empty DATA frames#39
                          Description
                          @github-actions
                          github-actions
                          bot
                          opened on Aug 19, 2026
                          h2 unbounded empty DATA frames
                          Details
                          Packageh2
                          Version0.3.27
                          URLGHSA-q83h-524g-xf6h
                          Date2026-08-17
                          Patched versions>=0.4.16
                          The h2 crate, used internally by hyper, had a flaw that would accept and queue empty DATA frames without limit.
                          
If streams were not actively drained, this could lead to unbounded memory usage, or a panic if the length overflows.
                          Low severity.
                          Patched in v0.4.16.
                          See advisory page for additional details.
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            No labels
                            No labels
                            Projects
                            No projects
                              Milestone
                              No milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                              Skip to content
                              RUSTSEC-2026-0258: h2 unbounded empty DATA frames #39
                              Open
                              Open
                              RUSTSEC-2026-0258: h2 unbounded empty DATA frames#39
                              Description
                              @github-actions
                              github-actions
                              bot
                              opened on Aug 19, 2026
                              h2 unbounded empty DATA frames
                              Details
                              Packageh2
                              Version0.3.27
                              URLGHSA-q83h-524g-xf6h
                              Date2026-08-17
                              Patched versions>=0.4.16
                              The h2 crate, used internally by hyper, had a flaw that would accept and queue empty DATA frames without limit.
                              
If streams were not actively drained, this could lead to unbounded memory usage, or a panic if the length overflows.
                              Low severity.
                              Patched in v0.4.16.
                              See advisory page for additional details.
                              Metadata
                              Metadata
                              Assignees
                              No one assigned
                                Labels
                                No labels
                                No labels
                                Projects
                                No projects
                                  Milestone
                                  No milestone
                                  Relationships
                                  None yet
                                  Development
                                  No branches or pull requests
                                  Issue actions