CVE-2026-21862CWE-290

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

High · published February 3, 2026

CVSS v4.0
7.7
EPSS
0%
Percentile
14.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.7 · HIGH
Vector
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
EPSS
0.00245 · 14.9th percentile
Weakness
CWE-290 · Authentication Bypass by Spoofing
Published
2026-02-03T16:06Z
EPSS history
Timeline
  • 03 FEB 16:06Z
    RustFS sourceIp bypass via spoofed X-Forwarded-For/Real-IP headers
    cvelistv5