CVE-2026-25223
CVE-2026-25223 · Fastify's Content-Type header tab character allows body validation bypass
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 7.5 · High · EPSS 0.9% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
Original sources
- 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
- https://nvd.nist.gov/vuln/detail/CVE-2026-25223