---
cve: "CVE-2026-33806"
severity: "HIGH"
cvss: 7.5
epss: "41%"
vendor: "fastify"
kev: false
exploited: false
published: "2026-04-15 04:17:36"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-06T11:49:38+02:00"
---

# CVE-2026-33806

> 7.5 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 3983cce8124714242099e8756a7a9a80a0ba0aea (Commit)

## Referenzen

- <https://github.com/fastify/fastify/security/advisories/GHSA-mg2h-6x62-wpwc>
- <https://cna.openjsf.org/security-advisories.html>
- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-33806) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_