{"cve":"CVE-2026-33806","nvd":{"published":"2026-04-15T04:17:36.650","modified":"2026-07-15T02:20:15.760","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-1287","CWE-1289"],"references":["https://cna.openjsf.org/security-advisories.html","https://github.com/fastify/fastify/security/advisories/GHSA-mg2h-6x62-wpwc","https://access.redhat.com/security/cve/CVE-2026-33806","https://bugzilla.redhat.com/show_bug.cgi?id=2458596","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33806.json"],"products":["fastify:fastify"],"source":"nvd","synced_at":"2026-10-19T22:30:49.762551342+00:00"},"epss":{"cve":"CVE-2026-33806","score":0.00448,"percentile":0.38972,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-247c-9743-5963","url":"https://osv.dev/vulnerability/GHSA-247c-9743-5963","summary":"Fastify has a Body Schema Validation Bypass via Leading Space in Content-Type Header","modified":"2026-07-08T08:11:12.813453393Z","packages":[{"ecosystem":"npm","name":"fastify","purl":"pkg:npm/fastify","ranges":[">=5.3.2 <5.8.5"],"fixed":["5.8.5"]}]},{"id":"GHSA-mg2h-6x62-wpwc","url":"https://osv.dev/vulnerability/GHSA-mg2h-6x62-wpwc","summary":"Fastify vulnerable to invalid content-type parsing, which could lead to validation bypass","modified":"2026-07-08T08:11:12.813453393Z","packages":[{"ecosystem":"npm","name":"fastify","purl":"pkg:npm/fastify","ranges":[">=5.0.0 <5.3.2"],"fixed":["5.3.2"]},{"ecosystem":"npm","name":"fastify","purl":"pkg:npm/fastify","ranges":[">=4.29.0 <4.29.1"],"fixed":["4.29.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}