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Advisory record · GHSA-pvxj-25m6-7vqr

Rancher Privilege escalation vulnerability via malicious "Connection" header

CVSS 8.8 HighEPSS 0.011 · 64th percentile

Published by the GitHub Advisory Database at 24 Apr 2024, 21:01 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/rancher/rancherGo>=2.0.0, <2.4.16 || >=2.5.0, <2.5.92.4.16, 2.5.9
Identifiers
GHSA-pvxj-25m6-7vqr · CVE-2021-31999 · GO-2024-2778
Weakness (CWE)
CWE-807
Tags
Published
24 Apr 2024
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Rancher versions >=2.0.0 before 2.4.16 and >=2.5.0 before 2.5.9 are vulnerable. A valid Rancher user with some permissions on a managed cluster can send a crafted API request through the cluster's Kubernetes API proxy, using the Connection header to strip impersonation headers, and read information they should not have access to. Upgrade to Rancher 2.4.16 or 2.5.9; no other mitigation is listed.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.8 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CNA (suse)
  • CISA KEV Not listed.
  • EPSS 0.011, the 64th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:15 UTC First seen by agentprime
  2. 31 Oct 2026, 14:15 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.