CVE-2026-22043
Status: AnalyzedMedium (5.7)—
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
- Version: 4.0
- Vector: 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
- Base score: 5.7
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.42%
- Percentile among all scored CVEs: 34
- Score date: 10/6/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
CWEs
- CWE-269, CWE-284
- CWE-522
References
Raw JSON (NVD)
Show
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"lastModified": "2026-06-17T10:19:24.933",
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"matchCriteriaId": "CBDD75C5-1A08-4758-9324-172C1D539322"
},
{
"criteria": "cpe:2.3:a:rustfs:rustfs:1.0.0:alpha78:*:*:*:rust:*:*",
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}
],
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}
]
}
],
"sourceIdentifier": "security-advisories@github.com"
}