Skip to content

deps(deps): update dependency fastify to v5.8.3 [security]#140

Open
renovate[bot] wants to merge 1 commit intostagingfrom
renovate/npm-fastify-vulnerability
Open

deps(deps): update dependency fastify to v5.8.3 [security]#140
renovate[bot] wants to merge 1 commit intostagingfrom
renovate/npm-fastify-vulnerability

Conversation

@renovate
Copy link
Copy Markdown
Contributor

@renovate renovate bot commented Apr 18, 2025 •
edited
Loading

ℹ️ Note

This PR body was truncated due to platform limits.

This PR contains the following updates:

Package Change Age Confidence
fastify (source) 5.0.0 → 5.8.3 age confidence

GitHub Vulnerability Alerts

CVE-2025-32442

Impact

In applications that specify different validation strategies for different content types, it's possible to bypass the validation by providing a slightly altered content type such as with different casing or altered whitespacing before ;.

Users using the the following pattern are affected:

fastify.post('/', {
  handler(request, reply) {
    reply.code(200).send(request.body)
  },
  schema: {
    body: {
      content: {
        'application/json': {
          schema: {
            type: 'object',
            properties: {
              'foo': {
                type: 'string',
              }
            },
            required: ['foo']
          }
        },
      }
    }
  }
})

User using the following pattern are not affected:

fastify.post('/', {
  handler(request, reply) {
    reply.code(200).send(request.body)
  },
  schema: {
    body: {
      type: 'object',
      properties: {
        'foo': {
          type: 'string',
        }
      },
      required: ['foo']
    }
  }
})

Patches

This was patched in v5.3.1, but unfortunately it did not cover all problems. This has been fully patched in v5.3.2.
Version v4.9.0 was also affected by this issue. This has been fully patched in v4.9.1.

Workarounds

Do not specify multiple content types in the schema.

References

Are there any links users can visit to find out more?

https://hackerone.com/reports/3087928

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-2026-25224

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

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

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

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

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

New Contributors

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

v5.4.0

Compare Source

What's Changed

Configuration

📅 Schedule: (in timezone Europe/Berlin)

  • Branch creation
    • ""
  • Automerge
    • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

  • If you want to rebase/retry this PR, check this box

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

@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch from b77204f to fae915f Compare April 18, 2025 20:51
@renovate renovate bot changed the title deps(deps): update dependency fastify to v5.3.1 [security] deps(deps): update dependency fastify to v5.3.2 [security] Apr 18, 2025
@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch from fae915f to 3e39026 Compare September 25, 2025 17:13
@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch from 3e39026 to 1265e02 Compare October 21, 2025 19:37
@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch from 1265e02 to d523f47 Compare November 18, 2025 23:28
@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch from d523f47 to a8edee9 Compare December 3, 2025 16:48
@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch from a8edee9 to 01e7486 Compare February 3, 2026 02:49
@renovate renovate bot changed the title deps(deps): update dependency fastify to v5.3.2 [security] deps(deps): update dependency fastify to v5.7.3 [security] Feb 3, 2026
@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch from 01e7486 to c89a816 Compare February 12, 2026 12:54
@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch 2 times, most recently from 364ef26 to d3879cf Compare March 25, 2026 22:50
@renovate renovate bot changed the title deps(deps): update dependency fastify to v5.7.3 [security] deps(deps): update dependency fastify to v5.8.3 [security] Mar 25, 2026
@renovate renovate bot changed the title deps(deps): update dependency fastify to v5.8.3 [security] deps(deps): update dependency fastify to v5.8.3 [security] - autoclosed Mar 27, 2026
@renovate renovate bot closed this Mar 27, 2026
@renovate renovate bot deleted the renovate/npm-fastify-vulnerability branch March 27, 2026 02:53
@renovate renovate bot changed the title deps(deps): update dependency fastify to v5.8.3 [security] - autoclosed deps(deps): update dependency fastify to v5.8.3 [security] Mar 31, 2026
@renovate renovate bot reopened this Mar 31, 2026
@renovate renovate bot force-pushed the renovate/npm-fastify-vulnerability branch from d3879cf to 31031d5 Compare March 31, 2026 10:01
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

No reviews

Assignees

No one assigned

Labels

None yet

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

0 participants