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benchmark: respect stream/iter broadcast backpressure - #63314

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benchmark: respect stream/iter broadcast backpressure#63314
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@trivikr

@trivikrtrivikr commented May 15, 2026

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This updates the stream/iter broadcast throughput benchmark to respect
backpressure from writer.writeSync().

Previously, the benchmark decremented remaining before checking whether
writeSync() accepted the chunk. Under default strict backpressure, rejected
writes could still be counted toward the benchmarked byte total. The iter path
now falls back to await writer.write(buf) for the same chunk and only counts it
after the write is accepted.

Assisted-by: openai:gpt-5.5

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Review requested:

  • @nodejs/performance

@nodejs-github-botnodejs-github-bot added benchmark Issues and PRs related to the benchmark subsystem. stream Issues and PRs related to the stream subsystem. labels May 15, 2026
@trivikr
benchmark: respect stream/iter broadcast backpressure
88ee786
Only decrement the remaining byte count after a stream/iter broadcast
write is accepted. If writeSync() is blocked by strict backpressure,
fall back to the async write() path for the same chunk.
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
@trivikr
trivikrforce-pushed the stream-iter-throughput-broadcast branch from 1da5fa8 to 88ee786CompareMay 15, 2026 01:06
@trivikrtrivikr changed the title benchmark: respect broadcast backpressurebenchmark: respect stream/iter broadcast backpressureMay 15, 2026
@trivikrtrivikr self-assigned this May 15, 2026
@trivikrtrivikr added author ready PRs that have at least one approval, no pending requests for changes, and a CI started. request-ci Add this label to start a Jenkins CI on a PR. labels May 15, 2026
@github-actionsgithub-actionsBot removed the request-ci Add this label to start a Jenkins CI on a PR. label May 15, 2026
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nodejs-github-bot commented May 15, 2026•
edited by jasnell
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CI: https://ci.nodejs.org/job/node-test-pull-request/73473/ 💚

@jasnelljasnell added the commit-queue Add this label to land a pull request using GitHub Actions. label May 15, 2026
@nodejs-github-botnodejs-github-bot added commit-queue-failed An error occurred while landing this pull request using GitHub Actions. and removed commit-queue Add this label to land a pull request using GitHub Actions. labels May 17, 2026
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Commit Queue failed
- Loading data for nodejs/node/pull/63314
✔ Done loading data for nodejs/node/pull/63314
----------------------------------- PR info ------------------------------------
Title benchmark: respect stream/iter broadcast backpressure (#63314)
⚠ Could not retrieve the email or name of the PR author's from user's GitHub profile!
Branch trivikr:stream-iter-throughput-broadcast -> nodejs:main
Labels stream, benchmark, author ready
Commits 1
- benchmark: respect stream/iter broadcast backpressure
Committers 1
- Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
PR-URL: https://github.com/nodejs/node/pull/63314
Reviewed-By: James M Snell <jasnell@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/63314
Reviewed-By: James M Snell <jasnell@gmail.com>
--------------------------------------------------------------------------------
ℹ This PR was created on Fri, 15 May 2026 01:05:45 GMT
✔ Approvals: 1
✔ - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/63314#pullrequestreview-4298652803
✘ This PR needs to wait 120 more hours to land (or 0 minutes if there is one more approval)
✔ Last GitHub CI successful
ℹ Green GitHub CI is sufficient
--------------------------------------------------------------------------------
✔ Aborted `git node land` session in /home/runner/work/node/node/.ncu
https://github.com/nodejs/node/actions/runs/25977767540

@trivikrtrivikr removed the commit-queue-failed An error occurred while landing this pull request using GitHub Actions. label May 18, 2026
@aduh95aduh95 added the commit-queue Add this label to land a pull request using GitHub Actions. label May 18, 2026
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aduh95 commented May 18, 2026

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@trivikr there's no need to run Jenkins CI on such PR FYI

@nodejs-github-botnodejs-github-bot removed the commit-queue Add this label to land a pull request using GitHub Actions. label May 18, 2026
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nodejs-github-bot merged commit 3b19867 into nodejs:mainMay 18, 2026
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Landed in 3b19867

@trivikr
trivikr deleted the stream-iter-throughput-broadcast branch May 18, 2026 14:07
@trivikr

trivikr commented May 18, 2026

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there's no need to run Jenkins CI on such PR FYI

You're right! Even the bot didn't add needs-ci label.

aduh95 pushed a commit that referenced this pull request May 19, 2026
@trivikr@aduh95
benchmark: respect stream/iter broadcast backpressure
88c85e4
Only decrement the remaining byte count after a stream/iter broadcast
write is accepted. If writeSync() is blocked by strict backpressure,
fall back to the async write() path for the same chunk.
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63314
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
aduh95 pushed a commit that referenced this pull request May 19, 2026
@trivikr@aduh95
benchmark: respect stream/iter broadcast backpressure
9a394ba
Only decrement the remaining byte count after a stream/iter broadcast
write is accepted. If writeSync() is blocked by strict backpressure,
fall back to the async write() path for the same chunk.
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63314
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
@github-actionsgithub-actionsBot mentioned this pull request May 19, 2026
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@aduh95aduh95 mentioned this pull request Jul 22, 2026
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@ghappforreleasepleaseghappforreleasepleaseBot mentioned this pull request Jul 27, 2026
Closed
aduh95 pushed a commit to aduh95/node that referenced this pull request Jul 30, 2026
@trivikr@aduh95
benchmark: respect stream/iter broadcast backpressure
0935202
Only decrement the remaining byte count after a stream/iter broadcast
write is accepted. If writeSync() is blocked by strict backpressure,
fall back to the async write() path for the same chunk.
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: nodejs#63314
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
@ghappforreleasepleaseghappforreleasepleaseBot mentioned this pull request Aug 3, 2026
Closed
jylenhof pushed a commit to jylenhof/mise-update-tool that referenced this pull request Aug 4, 2026
@github-actions@jylenhof
chore(mise): upgrade local tools
edf69b4
Automated mise tool upgrades from local config.
Updated tools:
- `action-validator`
- `actionlint`
- `aube`
- `editorconfig-checker`
- `ghalint`
- `node`
- `pinact`
- `pipx:gh-action-pulse`
- `prek`
- `rumdl`
- `shellcheck`
- `shfmt`
- `tombi`
- `uv`
- `yamlfmt`
- `yamllint`
- `zizmor`
Command: `mise upgrade --bump --local action-validator actionlint aube editorconfig-checker ghalint node pinact pipx:gh-action-pulse prek rumdl shellcheck shfmt tombi uv yamlfmt yamllint zizmor`
<details>
<summary>Version changelog (node)</summary>
| Tool | Requested | Installed |
|------|-----------|-----------|
| `node` | `24` → `26` | `24.18.1` → `26.5.1` |
</details>
<details>
<summary>Release notes (1 tools)</summary>
<details>
<summary>node: `24.18.1` → `26.5.1` (nodejs/node)</summary>
### v25.8.2
This is a security release.
### Notable Changes
* (CVE-2026-21637) wrap `SNICallback` invocation in `try`/`catch` (Matteo Collina) - High
* (CVE-2026-21710) use null prototype for `headersDistinct`/`trailersDistinct` (Matteo Collina) - High
* (CVE-2026-21711) include permission check to `pipe_wrap.cc` (RafaelGSS) - Medium
* (CVE-2026-21712) handle url crash on different url formats (RafaelGSS) - Medium
* (CVE-2026-21713) use timing-safe comparison in Web Cryptography HMAC and KMAC (Filip Skokan) - Medium
* (CVE-2026-21714) handle `NGHTTP2_ERR_FLOW_CONTROL` error code (RafaelGSS) - Medium
* (CVE-2026-21717) test array index hash collision (Joyee Cheung) - Medium
* (CVE-2026-21715) add permission check to `realpath.native` (RafaelGSS) - Low
* (CVE-2026-21716) include permission check on `lib/fs/promises` (RafaelGSS) - Low
### Commits
* \[[`2086b7477b`](nodejs/node@2086b7477b)] - **(CVE-2026-21717)** **build,test**: test array index hash collision (Joyee Cheung) [nodejs-private/node-private#834](https://github.com/nodejs-private/node-private/pull/834)
* \[[`0f9332a40a`](nodejs/node@0f9332a40a)] - **(CVE-2026-21713)** **crypto**: use timing-safe comparison in Web Cryptography HMAC and KMAC (Filip Skokan) [nodejs-private/node-private#822](https://github.com/nodejs-private/node-private/pull/822)
* \[[`2b6937ddb2`](nodejs/node@2b6937ddb2)] - **deps**: update undici to 7.24.4 (Node.js GitHub Bot) [#62271](nodejs/node#62271)
* \[[`bfb8ad5787`](nodejs/node@bfb8ad5787)] - **deps**: update undici to 7.24.3 (Node.js GitHub Bot) [#62233](nodejs/node#62233)
* \[[`be6384727f`](nodejs/node@be6384727f)] - **deps**: upgrade npm to 11.11.1 (npm team) [#62216](nodejs/node#62216)
* \[[`2feea5bb97`](nodejs/node@2feea5bb97)] - **deps**: V8: override… (truncated)
### v25.9.0
### Notable Changes
#### Test runner module mocking improvements
`MockModuleOptions.defaultExport` and `MockModuleOptions.namedExports` have been
consolidated into a single option `MockModuleOptions.exports` to align with user
expectations and other test runners.
A `default` property on `MockModuleOptions.exports` represents the default
export, and own enumerable properties are treated as named exports.
An automated migration is available to update user code:
<https://github.com/nodejs/userland-migrations/tree/main/recipes/mock-module-exports>
```bash
npx codemod @​nodejs/mock-module-exports
```
Contributed by sangwook in [#61727](nodejs/node#61727).
#### Other notable changes
* \[[`312476cb84`](nodejs/node@312476cb84)] - **(SEMVER-MINOR)** **async\_hooks**: add using scopes to `AsyncLocalStorage` (Stephen Belanger) [#61674](nodejs/node#61674)
* \[[`62d2cd473b`](nodejs/node@62d2cd473b)] - **(SEMVER-MINOR)** **cli**: add `--max-heap-size` option (tannal) [#58708](nodejs/node#58708)
* \[[`d0ebf0e44b`](nodejs/node@d0ebf0e44b)] - **(SEMVER-MINOR)** **crypto**: add `TurboSHAKE` and `KangarooTwelve` Web Cryptography algorithms (Filip Skokan) [#62183](nodejs/node#62183)
* \[[`f85b9d9fa8`](nodejs/node@f85b9d9fa8)] - **(SEMVER-MINOR)** **repl**: add customizable error handling (Anna Henningsen) [#62188](nodejs/node#62188)
* \[[`67b854d407`](nodejs/node@67b854d407)] - **(SEMVER-MINOR)** **repl**: remove dependency on `node:domain` (Matteo Collina) [#61227](nodejs/node#61227)
* \[[`966b700623`](nodejs/node@966b700623)] - **(SEMVER-MINOR)** **sea**: support code cache for ESM entrypoint in SEA (Joyee Cheung) [#62158](nodejs/node#62158)
*… (truncated)
### v26.0.0
We're excited to announce the release of Node.js 26! Highlights include the Temporal API enabled by default,
updates to the V8 JavaScript engine to 14.6, Undici to 8.0, and several important deprecations and removals
as we continue to modernize the platform.
As a reminder, Node.js 26 will enter long-term support (LTS) in October, but until then, it will be the "Current" release for the next six months.
We encourage you to explore the new features and benefits offered by this latest release and evaluate their potential impact on your applications.
### Notable Changes
#### Temporal API
The Temporal API is now enabled by default in Node.js 26. Temporal is a modern date/time API for JavaScript
that provides a more robust and feature-rich alternative to the legacy `Date` object.
Contributed by Richard Lau in [#61806](nodejs/node#61806).
#### V8 14.6
The V8 engine is updated to version 14.6.202.33, which is part of Chromium 134.
This version also includes:
* Upsert (<https://github.com/tc39/proposal-upsert>): `[Weak]Map.prototype.getOrInsert()`, `[Weak]Map.prototype.getOrInsertComputed()`
* Iterator sequencing (<https://github.com/tc39/proposal-iterator-sequencing>): `Iterator.concat()`
Contributed by Michaël Zasso in [#61898](nodejs/node#61898).
#### Undici 8
Undici has been updated to version 8.0.2, bringing new features and improvements to Node.js's HTTP client implementation.
#### Deprecations and Removals
* \[[`dff46c07c3`](nodejs/node@dff46c07c3)] - **(SEMVER-MAJOR)** **crypto**: move DEP0182 to End-of-Life (Tobias Nießen) [#61084](nodejs/node#61084)
* \[[`93c25815ee`](nodejs/node@93c25815ee)] - **(SEMVER-MAJOR)** **http**: move writeHeader to end-of-life (Sebastian Beltran) [#60635](nodejs/node#60635)
`http.Server.prototype.writeHeader()` is now fully removed. Use `http.Server.prototype.write… (truncated)
### v26.1.0
### Notable Changes
#### Experimental `node:ffi` module
Node.js now includes an experimental `node:ffi` module for loading dynamic
libraries and calling native symbols from JavaScript.
The API is gated behind the `--experimental-ffi` flag and, when the Permission
Model is enabled, requires `--allow-ffi`.
This API is inherently unsafe. Invalid pointers, incorrect signatures, or accessing memory
after it has been freed can crash the process or corrupt memory.
Contributed by Paolo Insogna in [#62072](nodejs/node#62072).
#### Other Notable Changes
* \[[`34a6454fe3`](nodejs/node@34a6454fe3)] - **(SEMVER-MINOR)** **buffer**: add `end` parameter (Robert Nagy) [#62390](nodejs/node#62390)
* \[[`073e84d7fe`](nodejs/node@073e84d7fe)] - **(SEMVER-MINOR)** **crypto**: accept key data in `crypto.diffieHellman()` and cleanup DH jobs (Filip Skokan) [#62527](nodejs/node#62527)
* \[[`5b9cb10a5f`](nodejs/node@5b9cb10a5f)] - **(SEMVER-MINOR)** **crypto**: implement `randomUUIDv7()` (nabeel378) [#62553](nodejs/node#62553)
* \[[`98f9becd16`](nodejs/node@98f9becd16)] - **(SEMVER-MINOR)** **debugger**: add edit-free runtime expression probes to `node inspect` (Joyee Cheung) [#62713](nodejs/node#62713)
* \[[`06defaa2ea`](nodejs/node@06defaa2ea)] - **(SEMVER-MINOR)** **fs**: add `signal` option to `fs.stat()` (Mert Can Altin) [#57775](nodejs/node#57775)
* \[[`db66a963bf`](nodejs/node@db66a963bf)] - **(SEMVER-MINOR)** **fs**: expose `frsize` field in `statfs` (Jinho Jang) [#62277](nodejs/node#62277)
* \[[`87adb3472b`](nodejs/node@87adb3472b)] - **(SEMVER-MINOR)** **http**: harden `ClientRequest` options merge (Matteo Collina) [#6… (truncated)
### v26.2.0
### Notable Changes
* \[[`189d43a193`](nodejs/node@189d43a193)] - **doc**: mark `stream.compose` stable (Matteo Collina) [#62562](nodejs/node#62562)
* \[[`f858c6140e`](nodejs/node@f858c6140e)] - **(SEMVER-MINOR)** **fs**: add `Temporal.Instant` support to `Stats` and `BigIntStats` (Livia Medeiros) [#60789](nodejs/node#60789)
* \[[`0cbb3895df`](nodejs/node@0cbb3895df)] - **(SEMVER-MINOR)** **http**: add `writeInformation` to send arbitrary 1xx status codes (Tim Perry) [#63155](nodejs/node#63155)
### Commits
* \[[`9a394bab84`](nodejs/node@9a394bab84)] - **benchmark**: respect stream/iter broadcast backpressure (Trivikram Kamat) [#63314](nodejs/node#63314)
* \[[`ad98b4620b`](nodejs/node@ad98b4620b)] - **crypto**: align verifyOneShot accepted types (Anshika Jain) [#63280](nodejs/node#63280)
* \[[`ba0736a847`](nodejs/node@ba0736a847)] - **crypto**: wire ML-DSA and ML-KEM for use when using BoringSSL (Filip Skokan) [#63255](nodejs/node#63255)
* \[[`5573a6a4a8`](nodejs/node@5573a6a4a8)] - **crypto**: wire ChaCha20-Poly1305 in Web Cryptography when using BoringSSL (Filip Skokan) [#63255](nodejs/node#63255)
* \[[`7dc563b8d6`](nodejs/node@7dc563b8d6)] - **crypto**: wire AES-KW in Web Cryptography when using BoringSSL (Filip Skokan) [#63255](nodejs/node#63255)
* \[[`b55e2b1f4d`](nodejs/node@b55e2b1f4d)] - **crypto**: improve system certificate enumeration logic on macOS (Robo) [#62576](nodejs/node#62576)
* \[[`fd509a755a`](nodejs/node@fd509a755a)] - **crypto**: harden CryptoKey algorithm slots… (truncated)
### v26.3.0
### Notable Changes
#### Potential changes to macOS Universal Binary availability
With Apple and its ecosystem progressively dropping support for Intel-based
architectures, it has become apparent that the Node.js project may not be able
to maintain the universal binaries we currently distribute for the full lifetime
of Node.js 26. This change serves to communicate that risk. At present, our
intention remains to continue shipping universal binaries supporting both Apple
Silicon and Intel-based Macs for as long as practical.
Contributed by Antoine du Hamel in [#63055](nodejs/node#63055).
#### Other notable changes
* \[[`a2a4b33dd8`](nodejs/node@a2a4b33dd8)] - **(SEMVER-MINOR)** **buffer**: increase `Buffer.poolSize` default to 64 KiB (Matteo Collina) [#63597](nodejs/node#63597)
* \[[`051a2152f7`](nodejs/node@051a2152f7)] - **crypto**: update root certificates to NSS 3.123.1 (Node.js GitHub Bot) [#63527](nodejs/node#63527)
* \[[`49462eca37`](nodejs/node@49462eca37)] - **(SEMVER-MINOR)** **http**: add `httpValidation` option to configure header value validation (RajeshKumar11) [#61597](nodejs/node#61597)
* \[[`97b7ab19bd`](nodejs/node@97b7ab19bd)] - **(SEMVER-MINOR)** **inspector**: expose precise coverage start to JS runtime (sangwook) [#63079](nodejs/node#63079)
* \[[`cfb80a2103`](nodejs/node@cfb80a2103)] - **(SEMVER-MINOR)** **lib,permission**: add `permission.drop` (Rafael Gonzaga) [#62672](nodejs/node#62672)
### Commits
* \[[`a2a4b33dd8`](nodejs/node@a2a4b33dd8)] - **(SEMVER-MINOR)** **buffer**: increase Buffer.poolSize default to 64 KiB (Matteo Collina) [#63597](nodejs/node#63597)
* \[[`0eff3e23b9`](https://github.com/nodejs/n… (truncated)
### v26.3.1
This is a security release.
### Notable Changes
* (CVE-2026-48618) tls: normalize hostname for server identity checks (Matteo Collina) – High
* (CVE-2026-48933) crypto: guard WebCrypto cipher output length (Filip Skokan) – High
* (CVE-2026-48615) lib,test: redact proxy credentials in tunnel errors (Matteo Collina) – Medium
* (CVE-2026-48619) http2: cap originSet size to prevent unbounded memory growth (Matteo Collina) – Medium
* (CVE-2026-48928) tls: fix case-sensitive SNI context matching (Matteo Collina) – Medium
* (CVE-2026-48930) dns,net: reject hostnames with embedded NUL bytes (Matteo Collina) – Medium
* (CVE-2026-48934) tls: bind reusable sessions to authenticated host (Matteo Collina) – Medium
* (CVE-2026-48617) permission: handle process.chdir on writereport (RafaelGSS) – Low
* (CVE-2026-48931) http: fix response queue poisoning in http.Agent (Matteo Collina) – Low
* (CVE-2026-48935) permission: disable FileHandle utimes with permission model (RafaelGSS) – Low
* (CVE-2026-48936) permission: guard pipe open and chmod with net scope (RafaelGSS) – Low
### Commits
* \[[`98fbc89211`](nodejs/node@98fbc89211)] - **(CVE-2026-48933)** **crypto**: guard WebCrypto cipher output length (Filip Skokan) [nodejs-private/node-private#878](https://github.com/nodejs-private/node-private/pull/878)
* \[[`110840f2c7`](nodejs/node@110840f2c7)] - **deps**: update llhttp to 9.4.2 (Antoine du Hamel) [nodejs-private/node-private#890](https://github.com/nodejs-private/node-private/pull/890)
* \[[`8d36d522b2`](nodejs/node@8d36d522b2)] - **deps**: update undici to 8.5.0 (Node.js GitHub Bot) [#63903](nodejs/node#63903)
* \[[`2e6d03993a`](nodejs/node@2e6d03993a)] - **deps**: update undici to 8.4.0 (Node.js GitHub Bot) [#63779](nodejs/node#63779)
* \[[`5a17d5b07a`](nodejs/node@5a17d5b07a)] - **deps… (truncated)
### v26.4.0
### Notable Changes
* \[[`cde0daabcc`](nodejs/node@cde0daabcc)] - **(SEMVER-MINOR)** **doc**: update `blockList` stability status to release candidate (alphaleadership) [#63050](nodejs/node#63050)
* \[[`b78f5a7537`](nodejs/node@b78f5a7537)] - **(SEMVER-MINOR)** **fs**: support caller-supplied `readFile()` buffers (Matteo Collina) [#63634](nodejs/node#63634)
* \[[`417aacbc36`](nodejs/node@417aacbc36)] - **(SEMVER-MINOR)** **http**: close pre-request sockets in `closeIdleConnections` (semimikoh) [#63470](nodejs/node#63470)
* \[[`fbb108be7d`](nodejs/node@fbb108be7d)] - **(SEMVER-MINOR)** **loader**: implement package maps (Maël Nison) [#62239](nodejs/node#62239)
* \[[`45494d5a8a`](nodejs/node@45494d5a8a)] - **(SEMVER-MINOR)** **net**: support `TCP_KEEPINTVL` and `TCP_KEEPCNT` in `setKeepAlive` (Guy Bedford) [#63825](nodejs/node#63825)
* \[[`ee29465e77`](nodejs/node@ee29465e77)] - **(SEMVER-MINOR)** **tls**: add certificateCompression option (Tim Perry) [#62217](nodejs/node#62217)
* \[[`b17817eb2b`](nodejs/node@b17817eb2b)] - **(SEMVER-MINOR)** **vfs**: dispatch `node:fs/promises` to mounted VFS instances (Matteo Collina) [#63537](nodejs/node#63537)
* \[[`7bc93a6ac5`](nodejs/node@7bc93a6ac5)] - **(SEMVER-MINOR)** **vfs**: add minimal `node:vfs` subsystem (Matteo Collina) [#63115](nodejs/node#63115)
### Commits
* \[[`c7eb83b46a`](nodejs/node@c7eb83b46a)] - **benchmark**: add child\_process async path baselines (Yagiz Nizipli) [#63929](nodejs/node#63929)
* \[[`066fff17a5`](https://github.com/nodejs/node/commit/066f… (truncated)
### v26.5.0
### Notable Changes
#### New release key
Welcome to our newest releaser, [Stewart X Addison](https://github.com/sxa). Future Node.js releases may be signed with his [release key](https://github.com/nodejs/node/blob/main/README.md#release-keys), `655F3B5C1FB3FA8D1A0CA6BDE4A7D232B936D2FD`.
#### Other notable changes
* \[[`55f48446c7`](nodejs/node@55f48446c7)] - **(SEMVER-MINOR)** **buffer**: implement blob.textStream() (Matthew Aitken) [#64036](nodejs/node#64036)
* \[[`b373202efc`](nodejs/node@b373202efc)] - **(SEMVER-MINOR)** **esm**: add `--experimental-import-text` flag (Efe) [#62300](nodejs/node#62300)
* \[[`39e0c14455`](nodejs/node@39e0c14455)] - **(SEMVER-MINOR)** **perf\_hooks**: sample delay per event loop iteration (Pablo Erhard) [#62935](nodejs/node#62935)
* \[[`999a83c937`](nodejs/node@999a83c937)] - **(SEMVER-MINOR)** **stream**: expose ReadableStreamTee (Matteo Collina) [#64195](nodejs/node#64195)
* \[[`4e0236dc3d`](nodejs/node@4e0236dc3d)] - **(SEMVER-MINOR)** **tls**: report negotiated TLS groups (Filip Skokan) [#64119](nodejs/node#64119)
### Commits
* \[[`87648c0a6c`](nodejs/node@87648c0a6c)] - **benchmark**: trim down the argon2 sets (Filip Skokan) [#64218](nodejs/node#64218)
* \[[`a483bfd3f0`](nodejs/node@a483bfd3f0)] - **buffer**: remove unreachable overflow check in atob (haramjeong) [#60161](nodejs/node#60161)
* \[[`6d14279688`](nodejs/node@6d14279688)] - **buffer**: add fast api for isUtf8 and isAscii (Gürgün Dayıoğlu) [#64169](nodejs/node#64169)
* \[[`55f48446c7`](nodejs/node@55f48446c7)] -… (truncated)
### v26.5.1
This is a security release.
### Notable Changes
* (CVE-2026-56848) http2: defer rst stream while in scope (Matteo Collina) – High
* (CVE-2026-58043) permission: avoid granting radix split nodes (RafaelGSS) – High
* (CVE-2026-56850) https: distinguish PFX object-array agent keys (RafaelGSS) – Medium
* (CVE-2026-58040) https: bind identity checks to session reuse (Matteo Collina) – Medium
* (CVE-2026-58041) sqlite: invalidate tag store iterators on statement reset (Matteo Collina) – Medium
* (CVE-2026-58042) dns: handle large resolveAny address replies (RafaelGSS) – Medium
* (CVE-2026-58045) zlib: throw on out-of-bounds write buffers (RafaelGSS) – Medium
* (CVE-2026-56847) permission: enforce fs write permission for trace events (RafaelGSS) – Low
* (CVE-2026-58039) permission: check final report output path (RafaelGSS) – Low
* (CVE-2026-58044) http: reject requests exceeding max header count (Matteo Collina) – Low
* deps: update llhttp to 9.4.3 (Paolo Insogna)
* deps: update undici to 8.9.0 (Node.js GitHub Bot)
### Commits
* \[[`af0bf96877`](nodejs/node@af0bf96877)] - **deps**: update llhttp to 9.4.3 (Paolo Insogna) [nodejs-private/node-private#935](https://github.com/nodejs-private/node-private/pull/935)
* \[[`0354678355`](nodejs/node@0354678355)] - **deps**: update undici to 8.9.0 (Node.js GitHub Bot) [#64712](nodejs/node#64712)
* \[[`dbeeaeec13`](nodejs/node@dbeeaeec13)] - **(CVE-2026-58042)** **dns**: handle large resolveAny address replies (RafaelGSS) [nodejs-private/node-private#929](https://github.com/nodejs-private/node-private/pull/929)
* \[[`064d339f56`](nodejs/node@064d339f56)] - **(CVE-2026-58044)** **http**: reject requests exceeding max header count (Matteo Collina) [nodejs-private/node-private#922](https://github.com/nodejs-private/node-private/pull/922)
* \[[`23b94c843a`](https://github.… (truncated)
_Omitted 12 older releases._
</details>
</details>
Modified files:
- `.mise.toml`
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