PT-2026-6099 · Rustfs · Rustfs

Enitmar + 1 · Published 2026-02-03 · Updated 2026-02-23 · CVE-2026-21862

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions RustFS versions prior to alpha.78

Description RustFS, a distributed object storage system, had a flaw in its access control mechanism. Specifically, the get condition values function improperly trusted the X-Forwarded-For and X-Real-Ip headers provided by clients without verifying a trusted proxy. This allowed any reachable client to spoof the aws:SourceIp and bypass IP-allowlist policies.

Recommendations Update to version alpha.78 or later.

Exploit

Fix

Authentication Bypass by Spoofing

Weakness Enumeration

CWE-290

Related Identifiers

CVE-2026-21862

GHSA-FC6G-2GCP-2QRQ

Affected Products

Rustfs

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21862.json · Exploit
• https://github.com/rustfs/rustfs/security/advisories/GHSA-fc6g-2gcp-2qrq · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-21862 · Security Note
• https://osv.dev/vulnerability/GHSA-fc6g-2gcp-2qrq · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-21862 · Vendor Advisory
• https://github.com/rustfs/rustfs · Note
• https://github.com/rustfs/rustfs/commit/b4ba62fa3300b5b258fdc0da141481e3be7ea960 · Note
• https://twitter.com/_cvereports/status/2018741294974038353 · Twitter Post
• https://t.me/cveNotify/152928 · Telegram Post