CVE-2025-32442: high-severity vulnerability in fastify
Fastify vulnerable to invalid content-type parsing, which could lead to validation bypass
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.7%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected products
fastify · fastifyRelated CVEs — fastify
In the same product, most dangerous first.
CVE-2022-39288HIGHDenial of service in Fastify via Content-Type headerEPSS 59.2%CVE-2026-25223HIGHFastify's Content-Type header tab character allows body validation bypassEPSS 0.9%CVE-2026-25224LOWFastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStreamEPSS 0.5%CVE-2026-76169HIGHfastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlersEPSS 0.5%CVE-2026-84428HIGHfastify vulnerable to header validation bypass via incomplete schema case normalizationEPSS 0.5%CVE-2026-84469HIGHfastify vulnerable to request validation bypass via skipped boolean false schemasEPSS 0.5%