CVE-2026-21862

RustFS sourceIp bypass via spoofed X-Forwarded-For/Real-IP headers

State: Published
Severity: 7.7 High
Published: Feb 3, 2026
Updated: Feb 3, 2026
Reserved: Jan 5, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	7.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P	GitHub_M

Weaknesses

CWE-290 Authentication Bypass by Spoofing

Affected Products

Product	Versions
rustfsrustfs	< alpha.78Affected

References

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

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