Bump undici from 5.28.4 to 6.24.0

[everettbu]

Mirror of facebook/react#36037
Original author: app/dependabot

---

Bumps undici from 5.28.4 to 6.24.0.

Release notes

Sourced from undici's releases.

v6.24.0

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

⚠️ Security Release

... (truncated)

Commits

• 8873c94 Bumped v6.24.0
• 411bd01 test(websocket): use node:assert for Node 18 compatibility
• 844bf59 test: fix http2 lint regressions in backport
• a444e4f test: stabilize h2 and tls-cert-leak under current test runner
• dc032a1 fix: h2 CI (#4395)
• 4cd3f4b test: increase bitness in test/fixtures/*.pem (#3659)
• 7df6442 fix: adapt websocket frame-limit handling for v6 parser
• 4e0179a fix: reject duplicate content-length and host headers
• 5a97f08 Fix websocket 64-bit length overflow
• e43e898 fix: validate upgrade header to prevent CRLF injection
• Additional commits viewable in compare view

Maintainer changes

This version was pushed to npm by [GitHub Actions](https://www.npmjs.com/~GitHub Actions), a new releaser for undici since your current version.

Install script changes

This version modifies prepare script that runs during installation. Review the package contents before updating.

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting ``@dependabot rebase.

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[greptile-apps]

Greptile Summary

This PR bumps undici from v5.28.4 to v6.24.0 (a major version upgrade) in the root package.json devDependencies, patching 5 security vulnerabilities including 3 High-severity CVEs (CVE-2026-1528, CVE-2026-2229, CVE-2026-1526) related to WebSocket frame handling and 2 Medium-severity CVEs (CVE-2026-1525, CVE-2026-1527) related to HTTP request smuggling and CRLF injection.

Key observations:

• undici is used exclusively as a devDependency — it polyfills File, FormData, fetch, and Request for test environments and flight fixture servers. All of these APIs remain exported in undici v6, so no callsite changes are required.
• The @fastify/busboy transitive dependency (previously required by undici v5) is correctly removed from yarn.lock, as undici v6 no longer depends on it.
• The fixture packages at fixtures/flight/package.json and fixtures/flight-esm/package.json still declare "undici": "^5.20.0" in their own dependency trees. Those fixtures continue to carry the patched vulnerabilities and may warrant follow-up PRs to bring them in line with this security fix.
• The PR description notes that undici v6's prepare install script has changed. This is undici's build-time script and does not introduce a supply chain risk for consumers, but it is worth verifying on a clean yarn install if CI hasn't already done so.

Confidence Score: 4/5

• This PR is safe to merge; it is a well-scoped security patch to a devDependency with no API breakage in the consuming code.
• Score is 4 rather than 5 because the fixture packages (fixtures/flight and fixtures/flight-esm) still pin undici v5 in their own package.json files and are not covered by this upgrade, leaving residual CVE exposure in those subtrees. All other aspects of the change are correct: the lock file is consistent, the removed transitive dependency (@fastify/busboy) is accounted for, and all imported undici APIs (File, FormData, fetch, Request) are preserved in v6.
• fixtures/flight/package.json and fixtures/flight-esm/package.json still reference undici@^5.20.0 and are not covered by this security bump.

Important Files Changed

Filename	Overview
package.json	Bumps undici devDependency from ^5.28.4 to ^6.24.0 to address 5 CVEs (including 3 High severity). Change is scoped to devDependencies only and doesn't affect published packages.
yarn.lock	Lock file correctly updated: removes the @fastify/busboy@^2.0.0 entry (a now-dropped transitive dependency of undici v5) and updates the undici entry to v6.24.0 with the correct resolved URL and integrity hash.

_{Last reviewed commit: 31b271b}