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fix(deps): update dependency fastify to v5 [security] #339

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fix(deps): update dependency fastify to v5 [security] #339

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@renovate renovate bot commented Feb 3, 2026

ℹ️ Note

This PR body was truncated due to platform limits.

This PR contains the following updates:

Package Change Age Confidence
fastify (source) ^4.0.1 → ^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

CVE-2026-25224

Impact

A Denial of Service vulnerability in Fastify’s Web Streams response handling can allow a remote client to exhaust server memory. Applications that return a ReadableStream (or Response with a Web Stream body) via reply.send() are impacted. A slow or non-reading client can trigger unbounded buffering when backpressure is ignored, leading to process crashes or severe degradation.

Patches

The issue is fixed in Fastify 5.7.3. Users should upgrade to 5.7.3 or later.

Workarounds

Avoid sending Web Streams from Fastify responses (e.g., ReadableStream or Response bodies). Use Node.js streams (stream.Readable) or buffered payloads instead until the project can upgrade.

References

Release Notes

fastify/fastify (fastify)

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

Full Changelog: fastify/fastify@v5.3.3...v5.4.0

v5.3.3

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What's Changed
New Contributors

Full Changelog: fastify/fastify@v5.3.2...v5.3.3

v5.3.2

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⚠️ Security Release ⚠️

Unfortunately, v5.3.1 did not include a complete fix for "Invalid content-type parsing could lead to validation bypass" and CVE-2025-32442. This is a follow-up patch to cover an edge case.

What's Changed
New Contributors

Full Changelog: fastify/fastify@v5.3.1...v5.3.2

v5.3.1

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⚠️ Security Release ⚠️
What's Changed
New Contributors

Full Changelog: fastify/fastify@v5.3.0...v5.3.1

v5.3.0

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What's Changed
New Contributors

Full Changelog: fastify/fastify@v5.2.2...v5.3.0

v5.2.2

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What's Changed
  • build: use static path instead of __filename by [@&#8203

Configuration

📅 Schedule: Branch creation - "" (UTC), Automerge - At any time (no schedule defined).

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