IP-based Access Control Bypass in RustFS Distributed Object Storage System
CVE-2026-21862

7.7HIGH

Key Information:

Vendor

Rustfs

Status
Rustfs
Vendor
CVE Published:
3 February 2026

What is CVE-2026-21862?

RustFS, a distributed object storage system written in Rust, has a security vulnerability that allows attackers to bypass IP-based access control measures. This issue arises because the 'get_condition_values' function accepts client-supplied X-Forwarded-For and X-Real-Ip headers without proper verification of trusted proxies. Consequently, any accessible client has the potential to spoof the 'aws:SourceIp' header, thus evading IP allowlist policies. Users are advised to upgrade to version alpha.78 or later, where this issue has been effectively mitigated.

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Affected Version(s)

rustfs < alpha.78

References

https://github.com/rustfs/rustfs/security/advisories/GHSA...
x_refsource_CONFIRM

CVSS V4

Score:
7.7
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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