CVE-2026-22043
Last modified
CVE-2026-22043 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.38% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Rustfs | Rustfs | 1.0.0 | Alpha13 |
References
- https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9Exploit, Vendor Advisory
- https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9Exploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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