Ghostwire

CVE-2026-33806: Impact: Fastify applications using schema.body.content for per-content-type body validation can have validation bypassed...

HIGH CVSS 7.5 EPSS 0.04% Exploit Available 2 PoC

Published: April 15, 2026 | Last Modified: April 15, 2026

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.

Ghostwire Analysis — What This Means Practically

Exploitation Probability (EPSS): Low — 0.04% (13th percentile)

Low exploitation probability based on current threat landscape data. Standard patching timeline is appropriate.

High CVSS score indicates significant risk — exploitation could lead to substantial data exposure or system compromise.
2 proof-of-concept exploits available on GitHub. Public exploit code lowers the barrier for both researchers and attackers.

This analysis is generated by Ghostwire from NVD, CISA KEV, EPSS, and open-source intelligence data. Verify findings through primary sources before acting.

CVE-2026-33806: Impact: Fastify applications using schema.body.content for per-content-type body validation can have validation bypassed...

Description

Ghostwire Analysis — What This Means Practically

Proof-of-Concept Exploits (2)

Security Coverage (1 articles)

References