{"id":"CVE-2026-33806","aliases":["CVE-2025-32442","GHSA-247c-9743-5963","GHSA-mg2h-6x62-wpwc"],"url":"https://o3.security/vulnerability/CVE-2026-33806","summary":"fastify vulnerable to Body Schema Validation Bypass via Leading Space in Content-Type Header","details":"Impact:\n\nFastify applications using schema.body.content for per-content-type body validation can have validation bypassed entirely by prepending a space to the Content-Type header. The body is still parsed correctly but schema validation is skipped.\n\nThis is a regression introduced in fastify >= 5.3.2 by the fix for CVE-2025-32442\n\nPatches:\n\nUpgrade to fastify v5.8.5 or later.\n\nWorkarounds:\n\nNone. Upgrade to the patched version.","published":"2026-04-15T00:14:02.376Z","modified":"2026-07-16T03:31:11.992367525Z","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":"5.8.5"}],"fix":null,"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33806.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-33806"},{"type":"ADVISORY","url":"https://cna.openjsf.org/security-advisories.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33806.json"},{"type":"ADVISORY","url":"https://github.com/fastify/fastify/security/advisories/GHSA-mg2h-6x62-wpwc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33806"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2458596"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-16T03:31:11.992367525Z"}}