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CVE-2026-21862

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Date: February 3, 2026

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.

Severity Score

Related Resources (5)

https://github.com/rustfs/rustfs/commit/b4ba62fa3300b5b258fdc0da141481e3be7ea960
https://github.com/rustfs/rustfs/security/advisories/GHSA-fc6g-2gcp-2qrq
https://github.com/rustfs/rustfs
https://nvd.nist.gov/vuln/detail/CVE-2026-21862
https://www.mend.io/vulnerability-database/CVE-2026-21862

Severity Score

Weakness Type (CWE)

Authentication Bypass by Spoofing

CWE-290

Top Fix

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Upgrade to version https://github.com/rustfs/rustfs.git - 1.0.0-alpha.78

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

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