CVE-2026-73285High· 7.5▾ Twilight

RustFS is a distributed object storage system built in Rust

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score41/ 100 · Moderate

impact 41.3 · likelihood 0.1 · exploitation 0

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Proof of concept

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Published

Aug 12, 2026

Updated

Sep 9, 2026

CVSS

7.5

Vendor

—

Product

—

CWE

CWE-863

Depth score

41 · Moderate

EPSS

0.46% · p40

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS history

Exploit-prediction probability, daily snapshots since Sep 9.

0.3% → 0.5%▲ 0.1%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 44 days

Aug 12, 2026Published
Disclosed via NVD
Sep 9, 2026Record revised
Last analysed / modified upstream
Sep 9, 2026EPSS first tracked
0.3%
Sep 25, 2026EPSS peak
0.3% → 0.5%

CWE-863 #nvd

Full technical detail▾

Overview

RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.64 until 1.0.0-rc.1, RustFS external OPA authorization enabled by RUSTFS_POLICY_PLUGIN_URL in crates/iam/src/sys.rs sets PreparedIamAuth.needs_existing_object_tag incorrectly for PreparedIamMode::Opa, causing maybe_merge_object_tag_conditions to omit s3:ExistingObjectTag/* values and allowing authenticated users to bypass tag-based policy restrictions. This issue is fixed in version 1.0.0-rc.1.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd

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