CVE-2026-21862

high-risk

Published 2026-02-03

RustFS is a distributed object storage system built in Rust. Prior to version alpha.78, IP-based access control can be bypassed: get_condition_values trusts client-supplied X-Forwarded-For/X-Real-Ip without verifying a trusted proxy, so any reachable client can spoof aws:SourceIp and satisfy IP-allowlist policies. This issue has been patched in version alpha.78.

Do I need to act?

0.04% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.5/10 High

NETWORK / LOW complexity

Affected Products (20)

Rustfs

Affected Vendors

Rustfs

References (1)

Vendor Advisory https://github.com/rustfs/rustfs/security/advisories/GHSA-fc6g-2gcp-2qrq

/ 100

high-risk

Severity 26/34 · High

Exploitability 0/34 · Minimal

Exposure 28/34 · Critical