CVE-2026-22043

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 70% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
30.3%
KEV
Not listed

Published

January 8, 2026

Last Modified

January 15, 2026

Advisory Details (1)

Auto-updated Jun 21, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

rustfs IAM deny_only Short-Circuit Allows Privilege Escalation via Service Account Minting · Advisory · rustfs/rustfs · GitHub

https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9

Affected Packages

(1 across 1 ecosystem)
crates.io(1)
PackageVulnerable rangeFixed inDependents
rustfs—1.0.0-alpha.79—

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 03:06 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
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  1. 2026-07-08 15:15 UTCEPSS rescore
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  3. 2026-07-06 16:27 UTCEPSS rescore
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  5. 2026-07-06 06:32 UTCOSV refresh
  6. 2026-07-06 02:23 UTCEPSS rescore
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  30. 2026-06-18 17:52 UTCEPSS rescore
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  32. 2026-06-17 17:44 UTCOSV refresh
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  40. 2026-06-10 22:18 UTCEPSS rescore
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  65. 2026-05-29 16:28 UTCEG score recompute
  66. 2026-05-29 13:44 UTCEPSS rescore
  67. 2026-05-29 13:44 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-22043?
CVE-2026-22043 is a critical vulnerability published on January 8, 2026. 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…
When was CVE-2026-22043 disclosed?
CVE-2026-22043 was first published in the National Vulnerability Database on January 8, 2026, with the most recent update on January 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-22043 actively exploited?
CVE-2026-22043 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 30.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-22043?
CVE-2026-22043 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-22043?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-22043, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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