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chore(deps): update dependency fastify to v5 [security]#18

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chore(deps): update dependency fastify to v5 [security]#18
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renovate/npm-fastify-vulnerability

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@renovate renovate bot commented Feb 3, 2026 •
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ℹ️ Note

This PR body was truncated due to platform limits.

This PR contains the following updates:

Package Change Age Confidence
fastify (source) ^3.29.5 → ^5.0.0 age confidence

GitHub Vulnerability Alerts

CVE-2026-25223

Impact

A validation bypass vulnerability exists in Fastify where request body validation schemas specified by Content-Type can be completely circumvented. By appending a tab character (\t) followed by arbitrary content to the Content-Type header, attackers can bypass body validation while the server still processes the body as the original content type.

For example, a request with Content-Type: application/json\ta will bypass JSON schema validation but still be parsed as JSON.

This vulnerability affects all Fastify users who rely on Content-Type-based body validation schemas to enforce data integrity or security constraints. The concrete impact depends on the handler implementation and the level of trust placed in the validated request body, but at the library level, this allows complete bypass of body validation for any handler using Content-Type-discriminated schemas.

This issue is a regression or missed edge case from the fix for a previously reported vulnerability.

Patches

This vulnerability has been patched in Fastify v5.7.2. All users should upgrade to this version or later immediately.

Workarounds

If upgrading is not immediately possible, user can implement a custom onRequest hook to reject requests containing tab characters in the Content-Type header:

fastify.addHook('onRequest', async (request, reply) => {
  const contentType = request.headers['content-type']
  if (contentType && contentType.includes('\t')) {
    reply.code(400).send({ error: 'Invalid Content-Type header' })
  }
})

Resources

Severity
  • CVSS Score: 7.5 / 10 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVE-2026-3635

Summary

When trustProxy is configured with a restrictive trust function (e.g., a specific IP like trustProxy: '10.0.0.1', a subnet, a hop count, or a custom function), the request.protocol and request.host getters read X-Forwarded-Proto and X-Forwarded-Host headers from any connection — including connections from untrusted IPs. This allows an attacker connecting directly to Fastify (bypassing the proxy) to spoof both the protocol and host seen by the application.

Affected Versions

fastify <= 5.8.2

Impact

Applications using request.protocol or request.host for security decisions (HTTPS enforcement, secure cookie flags, CSRF origin checks, URL construction, host-based routing) are affected when trustProxy is configured with a restrictive trust function.

When trustProxy: true (trust everything), both host and protocol trust all forwarded headers — this is expected behavior. The vulnerability only manifests with restrictive trust configurations.

Severity
  • CVSS Score: 6.1 / 10 (Medium)
  • Vector String: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Release Notes

fastify/fastify (fastify)

v5.8.3

Compare Source

⚠️ Security Release

This fixes CVE CVE-2026-3635 GHSA-444r-cwp2-x5xf.

What's Changed

New Contributors

Full Changelog: fastify/fastify@v5.8.2...v5.8.3

v5.8.2

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What's Changed

New Contributors

Full Changelog: fastify/fastify@v5.8.1...v5.8.2

v5.8.1

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⚠️ Security Release

Fixes "Missing End Anchor in "subtypeNameReg" Allows Malformed Content-Types to Pass Validation": GHSA-573f-x89g-hqp9.

CVE-2026-3419

Full Changelog: fastify/fastify@v5.8.0...v5.8.1

v5.8.0

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What's Changed

New Contributors

Full Changelog: fastify/fastify@v5.7.4...v5.8.0

v5.7.4

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Full Changelog: fastify/fastify@v5.7.3...v5.7.4

v5.7.3

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⚠️ Security Release
What's Changed

Full Changelog: fastify/fastify@v5.7.2...v5.7.3

v5.7.2

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⚠️ Notice ⚠️

Parsing of the content-type header has been improved to a strict parser in PR #​6414. This means only header values in the form described in RFC 9110 are accepted.

What's Changed

New Contributors

Full Changelog: fastify/fastify@v5.7.1...v5.7.2

v5.7.1

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What's Changed

Full Changelog: fastify/fastify@v5.7.0...v5.7.1

v5.7.0

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What's Changed

New Contributors

Full Changelog: fastify/fastify@v5.6.2...v5.7.0

v5.6.2

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v5.6.1

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What's Changed

New Contributors

Full Changelog: fastify/fastify@v5.6.0...v5.6.1

v5.6.0

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What's Changed

New Contributors

Full Changelog: fastify/fastify@v5.5.0...v5.6.0

v5.5.0

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What's Changed

New Contributors

Full Changelog: fastify/fastify@v5.4.0...v5.5.0

v5.4.0

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What's Changed

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

@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch 2 times, most recently from da7f627 to a4f4577 Compare February 18, 2026 07:59
@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch 2 times, most recently from a0549a8 to 5c91885 Compare February 25, 2026 08:41
@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch 2 times, most recently from 217504a to 851e287 Compare March 14, 2026 12:57
@renovate renovate bot changed the title chore(deps): update dependency fastify to v5 [security] chore(deps): update dependency fastify to v5 [security] - autoclosed Mar 28, 2026
@renovate renovate bot closed this Mar 28, 2026
@renovate renovate bot deleted the renovate/npm-fastify-vulnerability branch March 28, 2026 02:37
@renovate renovate bot changed the title chore(deps): update dependency fastify to v5 [security] - autoclosed chore(deps): update dependency fastify to v5 [security] Mar 31, 2026
@renovate renovate bot reopened this Mar 31, 2026
@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch 2 times, most recently from 851e287 to a456520 Compare March 31, 2026 08:38
@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch 2 times, most recently from 453feef to 1b2d1cb Compare April 19, 2026 08:50
@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch from 1b2d1cb to a431a7e Compare April 19, 2026 09:48
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