User Impersonation The advisory has been revoked - it doesn't affect any version of package rustfs (opens in a new tab)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUST-RUSTFS-15202486
- published4 Feb 2026
- disclosed3 Feb 2026
- creditMaxime Rossi Bellom, Ramtine
Introduced: 3 Feb 2026
CVE-2026-21862 (opens in a new tab)How to fix?
Upgrade rustfs to version 1.0.0-alpha.78 or higher.
Amendment
This was deemed not a vulnerability.
Overview
rustfs is a high-performance distributed object storage software built using Rust, one of the most popular languages worldwide. Along with MinIO, it shares a range of advantages such as simplicity, S3 compatibility, open-source nature, support for data lakes, AI, and big data. Furthermore, it has a better and more user-friendly open-source license in comparison to other storage systems, being constructed under the Apache license.
Affected versions of this package are vulnerable to User Impersonation via the get_condition_values function, which trusts client-supplied X-Forwarded-For and X-Real-Ip headers without verifying a trusted proxy. An attacker can bypass IP-based access controls by sending forged HTTP headers to impersonate allowed source IP addresses.