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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
fastify fastify
< 5.7.2affected
References
- https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq ↗
- https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821 ↗
- https://hackerone.com/reports/3464114 ↗
- https://fastify.dev/docs/latest/Reference/Validation-and-Serialization ↗
- https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125 ↗
- https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272 ↗
- https://access.redhat.com/security/cve/CVE-2026-25223 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2436560 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25223.json ↗
- https://access.redhat.com/errata/RHSA-2026:5807 ↗
- https://access.redhat.com/errata/RHSA-2026:10184 ↗
- https://access.redhat.com/errata/RHSA-2026:6192 ↗