CVSS 4.0
5.7 mediumCVSS: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:PCVE-2026-22043
Medium (5.7) in rustfs rustfs. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in rustfs 1.0.0-alpha.79.
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.
Severity
CVSS 3.1
9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 36% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-522, CWE-269, CWE-284
- Published
- Modified
- Record from
- the NVD, synced
Affected
- rustfs:rustfs
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-xgr5-qc6w-vcg9 | crates.io | rustfs | >=1.0.0-alpha.13 <1.0.0-alpha.79 | 1.0.0-alpha.79 |