---
cve: "CVE-2026-73285"
severity: "HIGH"
cvss: 7.5
epss: "0.3%"
vendor: "rustfs"
kev: false
exploited: false
published: "2026-08-12 14:37:42"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T20:04:47+02:00"
---

# CVE-2026-73285

> 7.5 HIGH · 🧪 PoC

## Beschreibung

RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.64 until 1.0.0-rc.1, RustFS external OPA authorization enabled by RUSTFS_POLICY_PLUGIN_URL in crates/iam/src/sys.rs sets PreparedIamAuth.needs_existing_object_tag incorrectly for PreparedIamMode::Opa, causing maybe_merge_object_tag_conditions to omit s3:ExistingObjectTag/* values and allowing authenticated users to bypass tag-based policy restrictions. This issue is fixed in version 1.0.0-rc.1.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 98d3619613722308498494d412797a52ea8ae64d (Commit)
- 778f1dfa2155cbbc61ad54e6896de9e29d2c4d8d (Commit)

## Referenzen

- <https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2>
- <https://github.com/rustfs/rustfs/commit/98d3619613722308498494d412797a52ea8ae64d>
- <https://github.com/rustfs/rustfs/blob/380ed40b471887014fe21d069b61df9eacca074b/.agents/skills/security-advisory-lessons/references/advisory-patterns.md?plain=1#L47>
- <https://github.com/rustfs/rustfs/releases/tag/1.0.0-rc.1>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73285) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_