Improper Validation of Specified Type of Input in Fastify - CVE-2025-32442
Published: April 18, 2025 / Updated: April 14, 2026
Vulnerability identifier: #VU125977
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-32442
CWE-ID: CWE-1287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: fastify.io
Affected software:
Fastify
Fastify
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass validation.
The vulnerability exists due to improper validation of syntactic correctness in content-type parsing when handling requests with slightly altered content-type values. A remote attacker can send a specially crafted request to bypass validation.
Only applications that define different validation strategies for different content types in the request body schema are affected.
How to mitigate CVE-2025-32442
Install security update from vendor's website.