---
cve: "CVE-2026-22043"
severity: "MEDIUM"
cvss: 5.7
epss: "0.4%"
vendor: "rustfs"
kev: false
exploited: false
published: "2026-01-08 15:15:45"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T03:40:51+02:00"
---

# CVE-2026-22043

> 5.7 MEDIUM · 🧪 PoC

## Beschreibung

RustFS is a distributed object storage system built in Rust. In versions 1.0.0-alpha.13 through 1.0.0-alpha.78, a flawed `deny_only` short-circuit in RustFS IAM allows a restricted service account or STS credential to self-issue an unrestricted service account, inheriting the parent’s full privileges. This enables privilege escalation and bypass of session/inline policy restrictions. Version 1.0.0-alpha.79 fixes the issue.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- a95e549430851f3c34ee4cc8dd7be60aa200e8c4 (Commit)

## Referenzen

- <https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-22043) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_