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CVE-2026-22043

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

Published: Jan 8, 2026Updated: Jan 15, 2026 Sources: CVE List NVD GHSACWE-269
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
0.4%
Top 70.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-269CWE-284CWE-522

Affected Products

rustfsrustfs
Library
OSS Libraries / generic-library
rustfscrates.ioOSS Libraries
rustfsoss-projectOSS Librariesaka rustfs
crates.iopackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

3 techniques
Credential Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-22043
nvd.nist.gov
https://github.com/rustfs/rustfs
github.com

Timeline

Published
Jan 8, 2026
Last Updated
Jan 15, 2026

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