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chore(deps): update dependency fastify to v5 [security] - #285

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chore(deps): update dependency fastify to v5 [security]#285
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renovate/npm-fastify-vulnerability

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This PR contains the following updates:

Package Change Age Confidence
fastify (source) 4.28.1 → 5.8.3 age confidence

Fastify's Content-Type header tab character allows body validation bypass

CVE-2026-25223 / GHSA-jx2c-rxcm-jvmq

More information

Details

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

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

Fastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStream

CVE-2026-25224 / GHSA-mrq3-vjjr-p77c

More information

Details

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

Severity

  • CVSS Score: 3.7 / 10 (Low)
  • Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

fastify: request.protocol and request.host Spoofable via X-Forwarded-Proto/Host from Untrusted Connections

CVE-2026-3635 / GHSA-444r-cwp2-x5xf

More information

Details

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

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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

Compare Source

What's Changed

New Contributors

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

v5.8.1

Compare Source

⚠️ 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

Compare Source

What's Changed

New Contributors

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

v5.7.4

Compare Source

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

v5.7.3

Compare Source

⚠️ Security Release

What's Changed

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

v5.7.2

Compare Source

⚠️ 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

Compare Source

What's Changed

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

v5.7.0

Compare Source

What's Changed

New Contributors

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

v5.6.2

Compare Source

What's Changed

New Contributors

Full Changelog: fastify/fastify@v5.6.1...v5.6.2

v5.6.1

Compare Source

What's Changed

New Contributors

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

v5.6.0

Compare Source

What's Changed

New Contributors

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

v5.5.0

Compare Source

What's Changed

✂ Note

PR body was truncated to here.

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

@renovate renovate Bot added the dependencies Pull requests that update a dependency file label Feb 2, 2026
@renovate
renovate Bot force-pushed the renovate/npm-fastify-vulnerability branch 2 times, most recently from ca8636d to 2a31354 Compare February 17, 2026 14:54
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renovate Bot force-pushed the renovate/npm-fastify-vulnerability branch from 2a31354 to b735534 Compare March 5, 2026 14:51
@renovate
renovate Bot force-pushed the renovate/npm-fastify-vulnerability branch from b735534 to d3c268f Compare March 13, 2026 10:55
@renovate
renovate Bot force-pushed the renovate/npm-fastify-vulnerability branch from d3c268f to fd2c3c8 Compare April 16, 2026 07:15
@renovate renovate Bot changed the title chore(deps): update dependency fastify to v5 [security] chore(deps): update dependency fastify to v5 [security] - autoclosed Apr 27, 2026
@renovate renovate Bot closed this Apr 27, 2026
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renovate Bot deleted the renovate/npm-fastify-vulnerability branch April 27, 2026 18:38
@renovate renovate Bot changed the title chore(deps): update dependency fastify to v5 [security] - autoclosed chore(deps): update dependency fastify to v5 [security] Apr 28, 2026
@renovate renovate Bot reopened this Apr 28, 2026
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renovate Bot force-pushed the renovate/npm-fastify-vulnerability branch 2 times, most recently from fd2c3c8 to 83604a5 Compare April 28, 2026 00:57
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renovate Bot force-pushed the renovate/npm-fastify-vulnerability branch 2 times, most recently from d958f7e to 9c74fb8 Compare July 16, 2026 23:57
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renovate Bot force-pushed the renovate/npm-fastify-vulnerability branch 2 times, most recently from e54a4bb to 8a10e97 Compare July 24, 2026 20:41
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renovate Bot force-pushed the renovate/npm-fastify-vulnerability branch from 8a10e97 to 8599540 Compare July 30, 2026 20:44
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