CVE-2026-22043

CRITICAL

Rustfs < 1.0.0-alpha.79 - Improper Access Control

Title source: rule

Description

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.

References (1)

[Exploit, Vendor Advisory] https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9

Scores

CVSS v3 9.8

EPSS 0.0002

EPSS Percentile 5.2%

Attack Vector NETWORK

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

Classification

CWE

CWE-284 CWE-269 CWE-522

Status published

Affected Products (50)

rustfs/rustfs

... and 35 more

Timeline

Published Jan 08, 2026

Tracked Since Feb 18, 2026