{"id":"CVE-2026-25223","title":"Fastify is a fast and low overhead web framework, for Node.js","summary":"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…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-436","CWE-179"],"vendor":"fastify","product":"fastify","affected":["fastify < 5.7.2"],"patched":["fastify 5.7.2"],"published":"2026-02-03","updated":"2026-06-30","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-25223","references":[{"url":"https://fastify.dev/docs/latest/Reference/Validation-and-Serialization","label":"security-advisories@github.com"},{"url":"https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125","label":"security-advisories@github.com"},{"url":"https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272","label":"security-advisories@github.com"},{"url":"https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821","label":"security-advisories@github.com"},{"url":"https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq","label":"security-advisories@github.com"},{"url":"https://hackerone.com/reports/3464114","label":"security-advisories@github.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:10184","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:5807","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:6192","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-25223","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2436560","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25223.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-25223"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25223"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00818,"epssPercentile":0.55648,"ingestedAt":"2026-07-03T18:53:52.164Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-02-04T21:18:10.359742Z"},"slug":"CVE-2026-25223","body":"## Overview\n\nFastify 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.\n\n## Affected\n\n- `fastify < 5.7.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `fastify 5.7.2`\n\n## Vendor advisories\n\n- **RHSA-2026:5807** · Red Hat · fixed in: Red Hat OpenShift AI 2.16 · released 2026-03-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:5807)\n- **RHSA-2026:10184** · Red Hat · fixed in: Red Hat OpenShift AI 2.25 · released 2026-04-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:10184)\n- **RHSA-2026:6192** · Red Hat · fixed in: Red Hat OpenShift Dev Spaces 3.27 · released 2026-03-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:6192)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · no fix planned: Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25223.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}