VDB
CVE-2026-33806
CVE-2026-33806
PUBLISHED
CVSS 7.5 HIGH
Reported by openjs · Published April 15, 2026
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.
EPSS 0.11% · 28.4th percentile
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS Score
0.11%
28.4th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| fastify | fastify | 5.3.2, 5.8.5 |
| fastify | fastify | 5.3.2, 5.8.5 |
Exploit Intelligence
- CIRCL seen: CVE-2026-33806 (circl-sighting)
- CIRCL seen: CVE-2026-33806 (circl-sighting)
- https://github.com/fastify/fastify/security/advisories/GHSA-mg2h-6x62-wpwc (circl)
- https://cna.openjsf.org/security-advisories.html (circl)
Timeline
- Apr 15, 2026 CVE Published
- Apr 15, 2026 PoC Published
- Apr 15, 2026 PoC Published
- Apr 16, 2026 Security Advisory
- Apr 16, 2026 Security Advisory
- Apr 24, 2026 CVE Updated
- May 18, 2026 EPSS Score
- May 19, 2026 EPSS Score
- May 20, 2026 EPSS Score
- May 21, 2026 EPSS Score
- May 22, 2026 EPSS Score
- May 23, 2026 EPSS Score