CVE-2026-22043

RustFS has IAM deny_only Short-Circuit that Allows Privilege Escalation via Service Account Minting

Published 8 Jan 2026Modified 17 Jun 2026CWE 269, 284, 522

In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

GHSA5.7CVSS: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

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by GHSA (medium).

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.

Affected packages and fixed versions

Source	Package	Fixed in
cargo::GitHub Security Advisory Rust	rustfs	1.0.0-alpha.79

References

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