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CVE-2026-21862— RustFS sourceIp bypass via spoofed X-Forwarded-For/Real-IP headers

Quick assessment

Affected
rustfs rustfs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

rustfs是RustFS开源的一个高性能对象存储系统。 RustFS alpha.78之前版本存在安全漏洞，该漏洞源于IP访问控制绕过，可能导致满足IP白名单策略。

AI Predicted 9.1 Difficulty: Trivial EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services
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I. Basic Information for CVE-2026-21862

Vulnerability Information
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Vulnerability Title
RustFS sourceIp bypass via spoofed X-Forwarded-For/Real-IP headers
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
rustfs 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
rustfs是RustFS开源的一个高性能对象存储系统。 RustFS alpha.78之前版本存在安全漏洞，该漏洞源于IP访问控制绕过，可能导致满足IP白名单策略。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rustfs rustfs < alpha.78 -

II. Public POCs for CVE-2026-21862

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III. Intelligence Information for CVE-2026-21862

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Vendor Advisories for CVE-2026-21862 (1)

IV. Related Vulnerabilities

Same product: rustfs
Same vendor: rustfs
Same weakness: CWE-290

V. Comments for CVE-2026-21862

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