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Vulnerabilities

Vulnerability · CVE-2026-40937

RustFS is a distributed object storage system built in Rust.

Published Apr 22, 2026 · catalog updated Jun 17, 2026 · RustFS is a distributed

Check if you run it

No confirmed exploitation is on record for CVE-2026-40937. EPSS is 0.49%. Act only if a listed version of RustFS is a distributed is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (RustFS is a distributed).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.49%
Remediation
Advisory link
Affected products
cpe rustfs/rustfs

RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-alpha.94, all four notification target admin API endpoints in use a helper that validates authentication only (access key + session token), without performing any admin-action authorization via . Every other admin handler in the codebase correctly calls with a specific . This is the only admin handler file that skips authorization. A non-admin user can overwrite a shared admin-defined notification target by name, causing subsequent bucket events to be delivered to an attacker-controlled endpoint. This enables cross-user event interception and audit evasion. 1.0.0-alpha.94 contains a patch.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe rustfs/rustfs1.0.0

How to fix CVE-2026-40937

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-40937. EPSS is 0.49%. Act only if a listed version of RustFS is a distributed is installed.

Which versions are affected?

Compare what you have installed with 1.0.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-862: Missing Authorization. EPSS 0.49%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 22, 2026 · NIST NVD

    Detected

    RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-alpha.94, all four notification target admin API endpoints in use a helper that validates authentication only (access key + session token), without performing any admin-action authorization via . Every other admin handler in the codebase correctly calls with a specific . This is the only admin handler file that skips autho

  2. Jun 17, 2026 · NIST NVD

    Updated

    RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-alpha.94, all four notification target admin API endpoints in use a helper that validates authentication only (access key + session token), without performing any admin-action authorization via . Every other admin handler in the codebase correctly calls with a specific . This is the only admin handler file that skips autho

Sources

  • CVE.orgVulnerability recordCVE-2026-40937

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-40937

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-40937

    RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-alpha.94, all four notification target admin API endpoints in use a helper that validates authentication only (access key + session token), without

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.