CVE-2026-33806
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
15/04/2026
Last modified:
17/04/2026
Description
Impact:<br />
<br />
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.<br />
<br />
This is a regression introduced in fastify >= 5.3.2 by the fix for CVE-2025-32442<br />
<br />
Patches:<br />
<br />
Upgrade to fastify v5.8.5 or later.<br />
<br />
Workarounds:<br />
<br />
None. Upgrade to the patched version.
Impact
Base Score 3.x
7.50
Severity 3.x
HIGH
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:a:fastify:fastify:*:*:*:*:*:node.js:*:* | 5.3.2 (including) | 5.8.5 (excluding) |
To consult the complete list of CPE names with products and versions, see this page