Vulnerability in Fastify
CVE-2025-32442
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.007 (51.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000
Affected products
- Fastify — versions 4.29.0, >= 5.0.0, < 5.3.2, = 4.29.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/fastify/fastify/security/advisories/GHSA-mg2h-6x62-wpwc (Exploit, Third Party Advisory)
- github.com/fastify/fastify/commit/436da4c06dfbbb8c24adee3a64de0c51e4f47418 (Patch)
- github.com/fastify/fastify/commit/f3d2bcb3963cd570a582e5d39aab01a9ae692fe4 (Patch)
- hackerone.com/reports/3087928 (Permissions Required)
Frequently asked questions
- What is CVE-2025-32442?
- CVE-2025-32442 is a high-severity vulnerability in Fastify, classified under CWE-1287. CVSS score: 7.5/10. Published 2025-04-18.
- How severe is CVE-2025-32442?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-32442 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.