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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.

PUBLISHED Reserved 2026-01-05 | Published 2026-01-08 | Updated 2026-01-08 | Assigner GitHub_M




MEDIUM: 5.7CVSS: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

Problem types

CWE-269: Improper Privilege Management

CWE-284: Improper Access Control

Product status

>= 1.0.0-alpha.13, < 1.0.0-alpha.79
affected

References

github.com/...rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9 exploit

github.com/...rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9

cve.org (CVE-2026-22043)

nvd.nist.gov (CVE-2026-22043)

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