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CVE-2026-21862

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

Published: Feb 3, 2026Updated: Feb 23, 2026 Sources: CVE List NVD GHSACWE-290
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.2%
Top 88.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-290

Affected Products

rustfsrustfs
Library
OSS Libraries / generic-library
rustfscrates.ioOSS Libraries
rustfsoss-projectOSS Librariesaka rustfs
crates.iopackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
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References

https://github.com/rustfs/rustfs/security/advisories/GHSA-fc6g-2gcp-2qrq
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-21862
nvd.nist.gov
https://github.com/rustfs/rustfs/commit/b4ba62fa3300b5b258fdc0da141481e3be7ea960
github.com
and 1 more references View all →

Timeline

Published
Feb 3, 2026
Last Updated
Feb 23, 2026

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