CVE-2026-33806 — fastify vulnerable to Body Schema Validation Bypass via Leading Space in Content-Type Header

Affected: fastify, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Dev Spaces

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.

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CVE-2026-33806 — fastify vulnerable to Body Schema Validation Bypass via Leading Space in Content-Type Header