CVE-2026-22042

RustFS has IAM Incorrect Authorization in ImportIam that Allows Privilege Escalation

State: Published
Severity: 5.7 Medium
Published: Jan 8, 2026
Updated: Jan 8, 2026
Reserved: Jan 5, 2026

Description

RustFS is a distributed object storage system built in Rust. Prior to version 1.0.0-alpha.79, he `ImportIam` admin API validates permissions using `ExportIAMAction` instead of `ImportIAMAction`, allowing a principal with export-only IAM permissions to perform import operations. Since importing IAM data performs privileged write actions (creating/updating users, groups, policies, and service accounts), this can lead to unauthorized IAM modification and privilege escalation. Version 1.0.0-alpha.79 fixes the issue.

Scores

CVSS	Score	Vector	Source
4.0	5.7 Medium	CVSS: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	GitHub_M

Weaknesses

CWE-285 Improper Authorization
CWE-863 Incorrect Authorization

Affected Products

Product	Versions
rustfsrustfs	< 1.0.0-alpha.79Affected

References

https://github.com/rustfs/rustfs/security/advisories/GHSA-vcwh-pff9-64cc

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