---
cve: "CVE-2026-25223"
severity: "HIGH"
cvss: 7.5
epss: "77%"
vendor: "fastify"
kev: false
exploited: false
published: "2026-02-03 22:16:31"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T13:53:20+02:00"
---

# CVE-2026-25223

> 7.5 HIGH · 🧪 PoC

## Beschreibung

Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.2, a validation bypass vulnerability exists in Fastify where request body validation schemas specified by Content-Type can be completely circumvented. By appending a tab character (\t) followed by arbitrary content to the Content-Type header, attackers can bypass body validation while the server still processes the body as the original content type. This issue has been patched in version 5.7.2.

## 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)

- e1e4fe75910c36e1b9ebb87026ca16c053a9c1f2 (Commit)
- 32d7b6add39ddf082d92579a58bea7018c5ac821 (Commit)

## Referenzen

- <https://github.com/fastify/fastify/security/advisories/GHSA-jx2c-rxcm-jvmq>
- <https://github.com/fastify/fastify/commit/32d7b6add39ddf082d92579a58bea7018c5ac821>
- <https://hackerone.com/reports/3464114>
- <https://fastify.dev/docs/latest/Reference/Validation-and-Serialization>
- <https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/content-type-parser.js#L125>
- <https://github.com/fastify/fastify/blob/759e9787b5669abf953068e42a17bffba7521348/lib/validation.js#L272>
- <https://access.redhat.com/errata/RHSA-2026:10184>
- <https://access.redhat.com/errata/RHSA-2026:5807>
- <https://access.redhat.com/errata/RHSA-2026:6192>
- <https://access.redhat.com/security/cve/CVE-2026-25223>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2436560>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25223.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-25223) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_