CVE-2026-22043

CRITICAL

RustFS 1.0.0-alpha.13-1.0.0-alpha.78 - Privilege Escalation via Flawed IAM deny_only Short-Circuit

Title source: llm
STIX 2.1

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)

Core 1
Core References

Scores

CVSS v3 9.8
EPSS 0.0038
EPSS Percentile 29.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-269 CWE-284 CWE-522
Status published
Products (2)
crates.io/rustfs 1.0.0-alpha.13 - 1.0.0-alpha.79crates.io
rustfs/rustfs 1.0.0 alpha13 (49 CPE variants)
Published Jan 08, 2026
Tracked Since Feb 18, 2026