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Vulnerabilities

Security fix · CVE-2025-32442

Fastify is a fast and low overhead web framework, for Node.js.

Published Apr 18, 2025 · catalog updated Aug 22, 2025 · Fastify is a fast

Check if you run it

No confirmed exploitation is on record for CVE-2025-32442. EPSS is 0.72%. Act only if a listed version of Fastify is a fast is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Fastify is a fast).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.72%
Remediation
Version ranges on file
Affected products
vendor fastify fastify 5.0.0, < 5.3.1

Fastify is a fast and low overhead web framework, for Node.js. In versions 5.0.0 to 5.3.0 as well as version 4.29.0, applications that specify different validation strategies for different content types have a possibility to bypass validation by providing a _slightly altered_ content type such as with different casing or altered whitespacing before . This was patched in v5.3.1, but the initial patch did not cover all problems. This has been fully patched in v5.3.2 and v4.29.1. A workaround involves not specifying individual content types in the schema.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor fastify fastify 5.0.0, < 5.3.15.0.0, < 5.3.1

How to fix CVE-2025-32442

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-32442. EPSS is 0.72%. Act only if a listed version of Fastify is a fast is installed.

Which versions are affected?

Compare what you have installed with fastify fastify 5.0.0, < 5.3.1 5.0.0, < 5.3.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.72%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 18, 2025 · EUVD

    Detected

    Fastify is a fast and low overhead web framework, for Node.js. In versions 5.0.0 to 5.3.0 as well as version 4.29.0, applications that specify different validation strategies for different content types have a possibility to bypass validation by providing a _slightly altered_ content type such as with different casing or altered whitespacing before . This was patched in v5.3.1, but the initial pat

  2. Aug 22, 2025 · EUVD

    Updated

    Fastify is a fast and low overhead web framework, for Node.js. In versions 5.0.0 to 5.3.0 as well as version 4.29.0, applications that specify different validation strategies for different content types have a possibility to bypass validation by providing a _slightly altered_ content type such as with different casing or altered whitespacing before . This was patched in v5.3.1, but the initial pat

Sources

  • CVE.orgVulnerability recordCVE-2025-32442

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-32442

    30-day exploitation probability 0.7%

    first.org
  • EUVDVulnerability recordEUVD-2025-11842

    Fastify is a fast and low overhead web framework, for Node.js. In versions 5.0.0 to 5.3.0 as well as version 4.29.0, applications that specify different validation strategies for different content types have a possibility to bypass validation by providing a _slightly altered_ con

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.