{"id":"CVE-2026-25223","aliases":["GHSA-jx2c-rxcm-jvmq"],"url":"https://o3.security/vulnerability/CVE-2026-25223","summary":"Fastify's Content-Type header tab character allows body validation bypass","details":"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.","published":"2026-02-03T21:21:40.268Z","modified":"2026-07-16T03:30:56.681102632Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"fastify","fixedVersion":"5.7.2"}],"fix":{"url":"https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821","label":"fastify/fastify@32d7b6a"},"references":[{"type":"WEB","url":"https://fastify.dev/docs/latest/Reference/Validation-and-Serialization"},{"type":"WEB","url":"https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125"},{"type":"WEB","url":"https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272"},{"type":"WEB","url":"https://hackerone.com/reports/3464114"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25223.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:10184"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:5807"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:6192"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-25223"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25223.json"},{"type":"ADVISORY","url":"https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25223"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2436560"},{"type":"FIX","url":"https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-16T03:30:56.681102632Z"}}