CVE-2026-33806

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.
Configurations

Configuration 1 (hide)

cpe:2.3:a:fastify:fastify:*:*:*:*:*:node.js:*:*

History

30 Jun 2026, 03:18

Type Values Removed Values Added
CWE CWE-1289
References
  • () 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 -

17 Apr 2026, 15:49

Type Values Removed Values Added
References () https://cna.openjsf.org/security-advisories.html - () https://cna.openjsf.org/security-advisories.html - Vendor Advisory
References () https://github.com/fastify/fastify/security/advisories/GHSA-mg2h-6x62-wpwc - () https://github.com/fastify/fastify/security/advisories/GHSA-mg2h-6x62-wpwc - Not Applicable
CPE cpe:2.3:a:fastify:fastify:*:*:*:*:*:node.js:*:*
First Time Fastify fastify
Fastify

15 Apr 2026, 04:17

Type Values Removed Values Added
New CVE

Information

Published : 2026-04-15 04:17

Updated : 2026-07-15 02:20


NVD link : CVE-2026-33806

Mitre link : CVE-2026-33806

CVE.ORG link : CVE-2026-33806


JSON object : View

Products Affected

fastify

  • fastify
CWE
CWE-1287

Improper Validation of Specified Type of Input

CWE-1289

Improper Validation of Unsafe Equivalence in Input