---
cve: "CVE-2026-27607"
severity: "HIGH"
cvss: 8.1
epss: "26%"
vendor: "rustfs"
kev: false
exploited: false
published: "2026-02-25 03:16:04"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T14:29:32+02:00"
---

# CVE-2026-27607

> 8.1 HIGH · 🧪 PoC

## Beschreibung

RustFS is a distributed object storage system built in Rust. In versions 1.0.0-alpha.56 through 1.0.0-alpha.82, RustFS does not validate policy conditions in presigned POST uploads (PostObject), allowing attackers to bypass content-length-range, starts-with, and Content-Type constraints. This enables unauthorized file uploads exceeding size limits, uploads to arbitrary object keys, and content-type spoofing, potentially leading to storage exhaustion, unauthorized data access, and security bypasses. Version 1.0.0-alpha.83 fixes the issue.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 9824171995b58da071c18b5243299bc69e6ec4a7 (Commit)

## Referenzen

- <https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-27607) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_