CVE-2026-33806

HighCVSS 7.5/10Last modified Jul 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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-1287 CWE-1289

Affected software

No affected versions have been published.

Timeline

Published: Apr 15, 2026
Last modified: Jul 15, 2026
NVD status: Modified

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