chore(deps): update dependency undici to v6.28.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
undici (source)	6.18.2 → 6.28.0

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Release Notes

nodejs/undici (undici)

v6.28.0

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Full Changelog: nodejs/undici@v6.27.0...v6.28.0

v6.27.0

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⚠️ Security Release

This release line addresses 4 security advisories.

Action required: Upgrade to undici 6.27.0 or later.

npm install undici@^6.27.0

Note on patched version: the v6 fixes shipped in v6.27.0, not 6.26.0
— v6.26.0 contains only the chunked-EOF fix (#​5308) and the version bump, none
of the security fixes below.

The v6 line is not affected by the SOCKS5 advisories (GHSA-vmh5-mc38-953g,
GHSA-hm92-r4w5-c3mj), the shared-cache disclosure (GHSA-pr7r-676h-xcf6), or the
8.x-only WebSocket regression (GHSA-38rv-x7px-6hhq).

Summary

Advisory	CVE	Severity (CVSS)	Fixed in	Fix commit
GHSA-vxpw-j846-p89q	CVE-2026-12151	High (7.5)	6.27.0	b7f252e7
GHSA-p88m-4jfj-68fv	CVE-2026-9679	Moderate (5.9)	6.27.0	25efa447
GHSA-g8m3-5g58-fq7m	CVE-2026-11525	Low (3.7)	6.27.0	25efa447
GHSA-35p6-xmwp-9g52	CVE-2026-6733	Low (3.7)	6.27.0	f4c31d60

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High severity

WebSocket DoS via fragment count bypass — CVE-2026-12151

GHSA-vxpw-j846-p89q · CWE-400, CWE-770
Fix: b7f252e7 Backport WebSocket maxPayloadSize fixes (#​5423, backported to v6 in #​5428)

A malicious WebSocket server can stream a large number of small or empty
continuation frames. Undici enforced a limit on cumulative payload size but did
not limit the number of fragments per message, leading to unbounded memory
growth and denial of service. All releases from 6.17.0 onward are affected.

• Affected: applications using new WebSocket(...) or WebSocketStream
  against untrusted endpoints.
• Workaround: none — upgrade is required.

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Moderate severity

HTTP header injection via Set-Cookie percent-decoding — CVE-2026-9679

GHSA-p88m-4jfj-68fv · CWE-93
Fix: 25efa447 fix(cookies): preserve values and parse SameSite strictly

parseSetCookie applied percent-decoding to cookie values, turning encoded
sequences like %0D%0A and %00 into literal bytes, contrary to RFC 6265 §5.4
and browser behavior. Applications forwarding parsed Set-Cookie values into
response headers were exposed to header injection, enabling session fixation,
open redirects, and cache poisoning.

• Workaround: sanitize values before forwarding — strip or reject CR, LF,
  NUL, ;, and =.

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Low severity

Set-Cookie SameSite attribute downgrade — CVE-2026-11525

GHSA-g8m3-5g58-fq7m · CWE-183
Fix: 25efa447 fix(cookies): preserve values and parse SameSite strictly

The cookie parser accepted SameSite values containing Strict, Lax, or
None as substrings rather than requiring exact matches per RFC 6265. Values
like SameSite=NoneOfYourBusiness parsed as None, and SameSite=StrictLax
parsed as Lax, silently weakening cookie security policies for apps that
forward parsed attributes.

HTTP response queue poisoning via keep-alive socket reuse — CVE-2026-6733

GHSA-35p6-xmwp-9g52 · CWE-367 (TOCTOU race condition)
Fix: f4c31d60 fix: guard idle socket validation to skip fresh sockets (#​5400)

An attacker controlling an upstream HTTP/1.1 server could inject unsolicited
responses onto idle keep-alive sockets. On socket reuse, the injected response
was associated with a new request, delivering responses to the wrong requests.

• Requirements: attacker-controlled/compromised upstream and active
  keep-alive reuse.
• Workaround: disable keep-alive reuse with keepAliveTimeout: 0 on the
  Client or Pool.

---

Release contents & deliberate backports

v6.27.0 is a security-only release — every change in it is one of the fixes
above, backported to the v6.x maintenance line on purpose:

• #5428 — backport of the WebSocket maxPayloadSize fragment-count / cumulative-size limits to v6.x (CVE-2026-12151; this is the v6 counterpart of the v7 backport #​5423).
• #5400 — idle-socket-validation fix for the queue-poisoning issue (CVE-2026-6733).

The cookie fix (25efa447,
covering both CVE-2026-9679 and CVE-2026-11525) was applied directly to the v6.x
branch. Full changelog:
v6.26.0...v6.27.0.

---

Credits

Per-advisory credits (as recorded in each GHSA):

• CVE-2026-12151 — reported by @​lpinca & @​Nadav0077; reviewed by @​UlisesGascon.
• CVE-2026-9679 — reported by @​tndud042713; fixed by @​mcollina; reviewed by @​KhafraDev & @​UlisesGascon.
• CVE-2026-11525 — fixed by @​mcollina; reviewed by @​UlisesGascon.
• CVE-2026-6733 — fixed by @​mcollina; verified by @​UlisesGascon.

v6.26.0

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What's Changed

• fix: validate EOF for chunked h1 responses by @​mcollina in #​5308

Full Changelog: nodejs/undici@v6.25.0...v6.26.0

v6.25.0

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What's Changed

Full Changelog: nodejs/undici@v6.24.1...v6.25.0

v6.24.1

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Full Changelog: nodejs/undici@v6.24.0...v6.24.1

v6.24.0

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Undici v6.24.0 Security Release Notes (LTS)

This release backports fixes for security vulnerabilities affecting the v6 line.

Upgrade guidance

All users on v6 should upgrade to v6.24.0 or later.

Fixed advisories

• GHSA-2mjp-6q6p-2qxm / CVE-2026-1525 (Medium)
  Inconsistent interpretation of HTTP requests (request/response smuggling class issue).

• GHSA-f269-vfmq-vjvj / CVE-2026-1528 (High)
  Malicious WebSocket 64-bit frame length handling could crash the client.

• GHSA-4992-7rv2-5pvq / CVE-2026-1527 (Medium)
  CRLF injection via the upgrade option.

• GHSA-v9p9-hfj2-hcw8 / CVE-2026-2229 (High)
  Unhandled exception from invalid server_max_window_bits in WebSocket permessage-deflate negotiation.

• GHSA-vrm6-8vpv-qv8q / CVE-2026-1526 (High)
  Unbounded memory consumption in WebSocket permessage-deflate decompression.

Not applicable to v6

• GHSA-phc3-fgpg-7m6h / CVE-2026-2581 affects >= 7.17.0 < 7.24.0 only.

Affected and patched ranges (v6)

• CVE-2026-1525: affected < 6.24.0, patched 6.24.0
• CVE-2026-1528: affected >= 6.0.0 < 6.24.0, patched 6.24.0
• CVE-2026-1527: affected < 6.24.0, patched 6.24.0
• CVE-2026-2229: affected < 6.24.0, patched 6.24.0
• CVE-2026-1526: affected < 6.24.0, patched 6.24.0

References

• GitHub Security Advisories: https://github.com/nodejs/undici/security/advisories
• NVD CVE-2026-1525: https://nvd.nist.gov/vuln/detail/CVE-2026-1525
• NVD CVE-2026-1528: https://nvd.nist.gov/vuln/detail/CVE-2026-1528
• NVD CVE-2026-1527: https://nvd.nist.gov/vuln/detail/CVE-2026-1527
• NVD CVE-2026-2229: https://nvd.nist.gov/vuln/detail/CVE-2026-2229
• NVD CVE-2026-1526: https://nvd.nist.gov/vuln/detail/CVE-2026-1526

v6.23.0

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⚠️ Security Release

This fixes GHSA-g9mf-h72j-4rw9 and CVE-2026-22036.

Full Changelog: nodejs/undici@v6.22.0...v6.23.0

v6.22.0

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What's Changed

• fix: fix wrong stream canceled up after cloning (v6) by @​snyamathi in #​4414
• [Backport v6.x] fix: fix EnvHttpProxyAgent for the Node.js bundle by @​github-actions[bot] in #​4432
• feat(ProxyAgent): match Curl behavior in HTTP->HTTP Proxy connections (#​4180) by @​metcoder95 in #​4433
• feat(ProxyAgent) improve Curl-y behavior in HTTP->HTTP Proxy connections (#​4180) (#​4340) by @​metcoder95 in #​4445
• Backport 4472 to v6.x by @​Uzlopak in #​4480

Full Changelog: nodejs/undici@v6.21.3...v6.22.0

v6.21.3

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What's Changed

• [Backport v6.x] append crlf to formdata body by @​github-actions in #​4210

Full Changelog: nodejs/undici@v6.21.2...v6.21.3

v6.21.2

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What's Changed

• fix(types): add missing DNS interceptor by @​slagiewka in #​4024
• [v6.x] fix wpts on windows by @​mcollina in #​4093
• Removed clients with unrecoverable errors from the Pool #​4088

New Contributors

• @​slagiewka made their first contribution in #​4024

Full Changelog: nodejs/undici@v6.21.1...v6.21.2

v6.21.1

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⚠️ Security Release ⚠️

Fixes CVE CVE-2025-22150 GHSA-c76h-2ccp-4975 (embargoed until 22-01-2025).

What's Changed

• fix(#​3736): back-port 183f8e9 to v6.x by @​ggoodman in #​3855
• fix(#​3817): send servername for SNI on TLS (#​3821) [backport] by @​metcoder95 in #​3864
• fix: sending formdata bodies with http2 (#​3863) [backport] by @​metcoder95 in #​3866
• [Backport v6.x] fix: Fixed the issue that there is no running request when http2 goaway by @​github-actions in #​3877
• types: [backport] Update return type of RetryCallback (#​3851) by @​metcoder95 in #​3876

Full Changelog: nodejs/undici@v6.21.0...v6.21.1

v6.21.0

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What's Changed

• [Backport v6.x] web: mark as uncloneable when possible (#​3709) by @​jazelly in #​3744
• [Backport v6.x] fetch: fix content-encoding order by @​github-actions in #​3764
• [Backport v6.x] fix: handle undefined deref() of WeakRef(socket) by @​github-actions in #​3822
• [Backport v6.x] fix: range end is zero-indexed by @​github-actions in #​3827

Full Changelog: nodejs/undici@v6.20.1...v6.21.0

v6.20.1

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What's Changed

• [Backport v6.x] jsdoc: add jsdoc to lib/web/fetch/constants.js by @​github-actions in #​3710
• [Backport v6.x] feat: implement BodyReadable.bytes by @​github-actions in #​3711
• fix: add more expectsPayload methods by @​ronag in #​3715
• [Backport v6.x] chore(H2): onboard H2 into Undici queueing system (#​3707) by @​Uzlopak in #​3724
• [Backport v6.x] fix: PoolBase kClose and kDestroy should await and not return the Promise by @​github-actions in #​3723
• [Backport v6.x] fix: extract noop everywhere by @​Uzlopak in #​3727

Full Changelog: nodejs/undici@v6.20.0...v6.20.1

v6.20.0

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What's Changed

• Remove patched dom types (v6.x branch) by @​eXhumer in #​3531
• docs(Backport v6.x): Fix signature of RetryHandler by @​github-actions in #​3594
• deps(dev): update @​types/node by @​metcoder95 in #​3618
• fix: throw on retry when payload is consume by downstream by @​github-actions in #​3596
• feat(Backport v6.x): move throwOnError to interceptor by @​github-actions in #​3595
• [Backport v6.x] fix: reduce memory usage in client-h1 by @​github-actions in #​3672
• [Backport v6.x] fix: refactor fast timers, fix UND_ERR_CONNECT_TIMEOUT on event loop blocking by @​github-actions in #​3673
• [Backport v6.x] fix: run asserts first if possible by @​github-actions in #​3674
• [Backport v6.x] fix: use fasttimers for all connection timeouts by @​github-actions in #​3675
• [Backport v6.x] ci: less flaky test/request-timeout.js test by @​github-actions in #​3678
• [Backport v6.x] test: less flaky timers acceptance test, rework fast timer tests to pass them faster by @​github-actions in #​3679
• [Backport v6.x] ignore leading and trailing crlfs in formdata body by @​github-actions in #​3681
• [Backport v6.x] mock: fix mocking of Uint8Array and ArrayBuffers as provided mock-responses by @​github-actions in #​3689
• [Backport v6.x] handle body errors by @​Uzlopak in #​3700

Full Changelog: nodejs/undici@v6.19.8...v6.20.0

v6.19.8

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Full Changelog: nodejs/undici@v6.19.7...v6.19.8

v6.19.7

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Full Changelog: nodejs/undici@v6.19.6...v6.19.7

v6.19.6

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Full Changelog: nodejs/undici@v6.19.5...v6.19.6

v6.19.5

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Full Changelog: nodejs/undici@v6.19.4...v6.19.5

v6.19.4

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Full Changelog: nodejs/undici@v6.19.3...v6.19.4

v6.19.3

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Full Changelog: nodejs/undici@v6.19.2...v6.19.3

v6.19.2

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What's Changed

• fix #​3337 by @​KhafraDev in #​3338
• build: use husky as husky install is deprecated by @​jazelly in #​3340
• fix: interceptors.d.ts has no default export by @​Uzlopak in #​3332

Full Changelog: nodejs/undici@v6.19.1...v6.19.2

v6.19.1

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What's Changed

• don't append empty origin by @​KhafraDev in #​3335

Full Changelog: nodejs/undici@v6.19.0...v6.19.1

v6.19.0

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What's Changed

• build(deps): bump ossf/scorecard-action from 2.3.1 to 2.3.3 by @​dependabot in #​3305
• build(deps): bump codecov/codecov-action from 4.3.1 to 4.4.1 by @​dependabot in #​3303
• build(deps): bump step-security/harden-runner from 2.7.1 to 2.8.0 by @​dependabot in #​3304
• build(deps): bump github/codeql-action from 3.25.3 to 3.25.7 by @​dependabot in #​3306
• build(deps): bump node from 9e8f45f to dd7e693 in /build by @​dependabot in #​3309
• build(deps): bump node from dd7e693 to e6d4495 in /build by @​dependabot in #​3313
• remove websocket experimental warning by @​KhafraDev in #​3311
• perf: optimization of request instantiation by @​tsctx in #​3107
• perf: convert object to params by @​DarkGL in #​3302
• build(deps-dev): bump borp from 0.14.0 to 0.15.0 by @​dependabot in #​3320
• build(deps-dev): bump c8 from 9.1.0 to 10.0.0 by @​dependabot in #​3321
• fix: add missing error classes to types by @​maxbeatty in #​3316
• export interceptor to type def file by @​jakecastelli in #​3318
• build(deps): bump node from e6d4495 to 075a5cc in /build by @​dependabot in #​3326
• doc: clearify the behaviour of bodyTimeout in the request by @​jakecastelli in #​3324
• feature: support pre-shared sessions by @​tastypackets in #​3325

New Contributors

• @​maxbeatty made their first contribution in #​3316
• @​jakecastelli made their first contribution in #​3318

Full Changelog: nodejs/undici@v6.18.2...v6.19.0

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