CVE-2025-32442

Description

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.

CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness Type (CWE)

CWE-1287 CWE-1287

Affected Products

Vendor	Product	Versions
fastify	fastify	5.0.0 — 5.3.2
fastify	fastify	All

References

Advisories & Patches

https://github.com/fastify/fastify/commit/436da4c06dfbbb8c24adee3a64de0c51e4f47418 https://github.com/fastify/fastify/commit/f3d2bcb3963cd570a582e5d39aab01a9ae692fe4

Exploits

https://github.com/fastify/fastify/security/advisories/GHSA-mg2h-6x62-wpwc

Other References

https://hackerone.com/reports/3087928

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-32442? +

CVE-2025-32442 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-32442? +

CVE-2025-32442 affects products from fastify, specifically: fastify. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-32442? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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