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CVE-2026-33806

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CVE-2026-33806

Published: Apr 15, 2026

Modified: Apr 15, 2026

PUBLISHED

CVSS v3.1

7.5

HIGH

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.

VendorProductVersions

fastify

fastify

affected
5.3.2 - < 5.8.5
unaffected
5.8.5

Weaknesses (CWE)

CWE-1287

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

References

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