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fix(security): update dependency undici to v6 [security]#1516

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fix(security): update dependency undici to v6 [security]#1516
renovate[bot] wants to merge 1 commit intomainfrom
renovate/major-vulnerability-updates

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@renovate renovate bot commented Apr 16, 2026

ℹ️ Note

This PR body was truncated due to platform limits.

This PR contains the following updates:

Package Change Age Confidence
undici (source) ^5.0.0^6.24.0 age confidence

Warning

Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

GitHub Vulnerability Alerts

CVE-2026-1525

Impact

Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names (e.g., Content-Length and content-length). This produces malformed HTTP/1.1 requests with multiple conflicting Content-Length values on the wire.

Who is impacted:

  • Applications using undici.request(), undici.Client, or similar low-level APIs with headers passed as flat arrays
  • Applications that accept user-controlled header names without case-normalization

Potential consequences:

  • Denial of Service: Strict HTTP parsers (proxies, servers) will reject requests with duplicate Content-Length headers (400 Bad Request)
  • HTTP Request Smuggling: In deployments where an intermediary and backend interpret duplicate headers inconsistently (e.g., one uses the first value, the other uses the last), this can enable request smuggling attacks leading to ACL bypass, cache poisoning, or credential hijacking

Patches

Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Workarounds

If upgrading is not immediately possible:

  1. Validate header names: Ensure no duplicate Content-Length headers (case-insensitive) are present before passing headers to undici
  2. Use object format: Pass headers as a plain object ({ 'content-length': '123' }) rather than an array, which naturally deduplicates by key
  3. Sanitize user input: If headers originate from user input, normalize header names to lowercase and reject duplicates
Severity
  • CVSS Score: 6.5 / 10 (Medium)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

CVE-2026-1527

Impact

When an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:

  1. Inject arbitrary HTTP headers
  2. Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch)

The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters:

// lib/dispatcher/client-h1.js:1121
if (upgrade) {
  header += `connection: upgrade\r\nupgrade: ${upgrade}\r\n`
}

Patches

Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Workarounds

Sanitize the upgrade option string before passing to undici:

function sanitizeUpgrade(value) {
  if (/[\r\n]/.test(value)) {
    throw new Error('Invalid upgrade value')
  }
  return value
}

client.request({
  upgrade: sanitizeUpgrade(userInput)
})
Severity
  • CVSS Score: 4.6 / 10 (Medium)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Release Notes

nodejs/undici (undici)

v6.24.0

Compare Source

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

Not applicable to v6

Affected and patched ranges (v6)

References

v6.23.0

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

v6.22.0

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What's Changed

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

v6.21.3

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What's Changed

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

v6.21.2

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What's Changed

New Contributors

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

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

v6.21.0

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What's Changed

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

v6.20.1

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What's Changed

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

v6.20.0

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What's Changed

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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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

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

v6.19.1

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What's Changed

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

v6.19.0

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What's Changed

New Contributors

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

v6.18.2

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What's Changed

Full Changelog: nodejs/undici@v6.18.1...v6.18.2

v6.18.1

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What's Changed

New Contributors

Full Changelog: nodejs/undici@v6.18.0...v6.18.1

v6.18.0

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What's Changed

Full Changelog: nodejs/undici@v6.17.0...v6.18.0

v6.17.0

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What's Changed

New Contributors

Full Changelog: nodejs/undici@v6.16.1...v6.17.0

v6.16.1

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What's Changed

Full Changelog: nodejs/undici@v6.16.0...v6.16.1

v6.16.0

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What's Changed

New Contributors

Full Changelog: nodejs/undici@v6.15.0...v6.16.0

v6.15.0

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What's Changed

New Contributors

Full Changelog: nodejs/undici@v6.14.1...v6.15.0

v6.14.1

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What's Changed

Full Changelog: nodejs/undici@v6.14.0...v6.14.1

v6.14.0

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What's Changed

New Contributors

Full Changelog: nodejs/undici@v6.13.0...v6.14.0

v6.13.0

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What's Changed

New Contributors

Full Changelog: nodejs/undici@v6.12.0...v6.13.0

v6.12.0

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What's Changed

New Contributors

Full Changelog: nodejs/undici@v6.11.1...v6.12.0

v6.11.1

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⚠️ Security Release ⚠️

What's Changed

Full Changelog: nodejs/undici@v6.11.0...v6.11.1

v6.11.0

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What's Changed

Full Changelog: <https://github.com/nodejs/undici/compare


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

@renovate renovate bot requested a review from a team as a code owner April 16, 2026 08:35
@renovate renovate bot added the renovate label Apr 16, 2026
@renovate renovate bot requested a review from a team as a code owner April 16, 2026 08:35
@renovate renovate bot force-pushed the renovate/major-vulnerability-updates branch from ba6b82a to 2ffc678 Compare April 16, 2026 21:18
@renovate renovate bot changed the title fix(security): update dependency undici to v8 [security] fix(security): update dependency undici to v6 [security] Apr 16, 2026
@renovate renovate bot force-pushed the renovate/major-vulnerability-updates branch from 2ffc678 to 5874eca Compare April 17, 2026 19:12
@renovate renovate bot changed the title fix(security): update dependency undici to v6 [security] fix(security): update dependency undici to v8 [security] Apr 17, 2026
@renovate renovate bot force-pushed the renovate/major-vulnerability-updates branch from 5874eca to 4e43faa Compare April 17, 2026 19:14
@renovate renovate bot changed the title fix(security): update dependency undici to v8 [security] fix(security): update dependency undici to v6 [security] Apr 17, 2026
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