CVE-2026-21862: RustFS has SourceIp bypass via spoofed X-Forwarded-For/Real-IP headers

CVE-2026-21862 · Severity: medium · CVSS 4 · Published 2026-02-03

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

Technologies: rustfs (crates.io). Vendors: crates.io.

Quick answers

Is CVE-2026-21862 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-21862 being exploited in the wild.
How severe is CVE-2026-21862?
Medium severity, with a CVSS score of 4, published 3 February 2026.
Which products and versions are affected?
rustfs (crates.io) SEMVER:introduced=0,fixed=1.0.0-alpha.78.
Is there a fix for CVE-2026-21862?
Yes. rustfs (crates.io): upgrade to 1.0.0-alpha.78 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-21862?
Check whether you run rustfs (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • rustfs (crates.io): upgrade to 1.0.0-alpha.78 or later
    cargo update -p rustfs

Affected products

  • rustfs (crates.io) SEMVER:introduced=0,fixed=1.0.0-alpha.78

Identifiers

  • CVE-2026-21862
  • GHSA-fc6g-2gcp-2qrq

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