Detections
Analytics
CVE-2026-25223
high
Description
Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.2, a validation bypass vulnerability exists in Fastify where request body validation schemas specified by Content-Type can be completely circumvented. By appending a tab character (\t) followed by arbitrary content to the Content-Type header, attackers can bypass body validation while the server still processes the body as the original content type. This issue has been patched in version 5.7.2.
References
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25223.json
https://hackerone.com/reports/3464114
https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq
https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821
https://fastify.dev/docs/latest/Reference/Validation-and-Serialization
https://bugzilla.redhat.com/show_bug.cgi?id=2436560
https://access.redhat.com/security/cve/CVE-2026-25223
https://access.redhat.com/errata/RHSA-2026:6192