{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-25223","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-01-30T14:44:47.327Z","datePublished":"2026-02-03T21:21:40.268Z","dateUpdated":"2026-02-04T21:18:16.693Z"},"containers":{"cna":{"title":"Fastify's Content-Type header tab character allows body validation bypass","problemTypes":[{"descriptions":[{"cweId":"CWE-436","lang":"en","description":"CWE-436: Interpretation Conflict","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq","tags":["x_refsource_CONFIRM"],"url":"https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq"},{"name":"https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821","tags":["x_refsource_MISC"],"url":"https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821"},{"name":"https://hackerone.com/reports/3464114","tags":["x_refsource_MISC"],"url":"https://hackerone.com/reports/3464114"},{"name":"https://fastify.dev/docs/latest/Reference/Validation-and-Serialization","tags":["x_refsource_MISC"],"url":"https://fastify.dev/docs/latest/Reference/Validation-and-Serialization"},{"name":"https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125","tags":["x_refsource_MISC"],"url":"https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125"},{"name":"https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272","tags":["x_refsource_MISC"],"url":"https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272"}],"affected":[{"vendor":"fastify","product":"fastify","versions":[{"version":"< 5.7.2","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-02-03T21:21:40.268Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-jx2c-rxcm-jvmq","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-04T21:18:10.359742Z","id":"CVE-2026-25223","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-02-04T21:18:16.693Z"}}]}}