CVE-2026-25705 Rancher Extensions have arbitrary file access via path traversal
Attackers can exploit path traversal in Rancher UI extensions to overwrite binaries or configuration, leading to code execution and privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-25705?
CVE-2026-25705 is a high-severity path traversal vulnerability in SUSE rancher, published on 13 May 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
A vulnerability has been identified in [Rancher's Extensions](https://ranchermanager.docs.rancher.com/integrations-in-rancher/rancher-extensions) where malicious code can be injected in Rancher through a path traversal in the `compressedEndpoint` field inside a `UIPlugin` deployment. A malicious UI extension could abuse that to: * Overwrite Rancher binaries or configuration to inject code.
* Write to /var/lib/rancher/ to tamper with cluster state.
* If hostPath volumes are mounted, write to the host node filesystem.
* Use this issue to chain with other attack vectors.
Weakness: CWE-35
Which versions are affected by CVE-2026-25705?
9 open source packages ship an affected version, including github.com/rancher/rancher.
| Package | Affected | Fixed in |
|---|---|---|
github.com/rancher/rancher Go | All versions | None |
github.com/rancher/rancher Go | From 2.10.11 | 2.11.13 |
github.com/rancher/rancher Go | From 2.10.11 | 2.11.13 |
github.com/rancher/rancher Go | From 2.12.0 | 2.12.9 |
github.com/rancher/rancher Go | From 2.12.0 | 2.12.9 |
github.com/rancher/rancher Go | From 2.13.0 | 2.13.5 |
3 more packages
github.com/rancher/rancher Go | From 2.13.0 | 2.13.5 |
github.com/rancher/rancher Go | From 2.14.0 | 2.14.1 |
github.com/rancher/rancher Go | From 2.14.0 | 2.14.1 |
How do I fix CVE-2026-25705?
Upgrade github.com/rancher/rancher to a fixed version for your release line: 2.11.13, 2.12.9, 2.13.5 or 2.14.1.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-25705 being exploited?
There is no known exploitation of CVE-2026-25705 in the wild and no public exploit code.
Sources
Also known as GHSA-5v3h-x4wf-5c35, GO-2026-5154.