CVE-2026-25705: SUSE Rancher path traversal in UI Extensions

CVE-2026-25705 · Severity: high · CVSS 8.4 · Published 2026-05-13

Rancher is a popular platform for managing Kubernetes clusters. A vulnerability in its extension system allows a malicious extension to access or overwrite sensitive files on the management server. This could lead to a complete takeover of the Rancher environment, tampering with cluster states, or unauthorized access to the underlying host system.

Technologies: github.com/rancher/rancher (Go), Suse Rancher. Vendors: Go, Suse.

Quick answers

Is CVE-2026-25705 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-25705 being exploited in the wild.
How severe is CVE-2026-25705?
High severity, with a CVSS score of 8.4, published 13 May 2026.
Which products and versions are affected?
github.com/rancher/rancher (Go) SEMVER:introduced=0, SEMVER:introduced=2.14.0,fixed=2.14.1; Suse Rancher >= 2.14.0, < 2.14.1; >= 2.13.0, < 2.13.5; >= 2.12.0, < 2.12.9; >= 2.10.11, < 2.11.13, >=2.14.0, <2.14.1; >=2.13.0, <2.13.5; >=2.12.0, <2.12.9; >=2.11.0, <2.11.13; >=v2.10.11.
Is there a fix for CVE-2026-25705?
Yes. github.com/rancher/rancher (Go): upgrade to 2.14.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-25705 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-25705?
Check whether you run github.com/rancher/rancher (Go) or Suse Rancher 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

  • github.com/rancher/rancher (Go): upgrade to 2.14.1 or later
    go get github.com/rancher/rancher@v2.14.1

Technical details

A path traversal vulnerability (CWE-35) exists in Rancher's Extensions mechanism, specifically within the 'compressedEndpoint' field of a 'UIPlugin' deployment and icon references in 'index.yaml'. An attacker with permissions to deploy UI extensions (typically an administrator) can use '../' sequences to escape the intended directory. This allows for overwriting Rancher binaries, modifying configuration files, or accessing the host node filesystem if hostPath volumes are mounted. The vulnerability is exploited by providing a malicious URI or file path that resolves outside the restricted cache or repository directories. Patches have been released to enforce strict path validation and ensure files remain within designated directories.

Affected products

  • SUSE Rancher >= 2.14.0, < 2.14.1; >= 2.13.0, < 2.13.5; >= 2.12.0, < 2.12.9; >= 2.10.11, < 2.11.13

Identifiers

  • CVE-2026-25705
  • GHSA-5v3h-x4wf-5c35
  • GO-2026-5154

Timeline

  • 2026-04-30: disclosed: Initial disclosure to rancher/rancher repository
  • 2026-05-07: advisory: GitHub Advisory published
  • 2026-05-13: other: NVD publication date

References

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