Description
Impact: Fastify 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. This is a regression introduced in fastify >= 5.3.2 by the fix for CVE-2025-32442 Patches: Upgrade to fastify v5.8.5 or later. Workarounds: None. Upgrade to the patched version.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
fastify fastify
Default version status: unaffected
5.3.2 to < 5.8.5affected5.8.5unaffected
pkg:npm/fastifyReferences
- https://github.com/fastify/fastify/security/advisories/GHSA-mg2h-6x62-wpwc ↗
- https://cna.openjsf.org/security-advisories.html ↗
- 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 ↗