Loading...
Skip to main content
GeekWala

CVE-2026-25705 — Vulnerability in github.com/rancher/rancher — CVE...

HIGH

Rancher Extensions have arbitrary file access via path traversal

Published May 7, 2026Updated September 10, 2026Source: osv

Summary

### Impact 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. By default only the administrator can deploy UI extensions, unless permissions are granted to other users. It's always recommended to only install extensions that come from sources trusted by the user. Please consult the associated [MITRE CAPEC-126 - Technique - Path Traversal](https://capec.mitre.org/data/definitions/126.html) for further information about this category of attack. ### Patches This vulnerability is addressed by ensuring that: - The file defined by the UI Plugin CR's `compressedEndpoint` has to be created inside the cache directory and cannot contain `../`. If that is not possible, the installation will fail and the file won't be created. - The icons referenced by Cluster Repos' `index.yaml` file always resolves to a file inside the repository directory. Patched versions of Rancher include releases v2.14.1, v2.13.5, v2.12.9, v2.11.13. ### Workarounds There is no workaround. The user must be careful about which UI Plugins they install. ### Resources If there are any questions or comments about this advisory: - Reach out to the [SUSE Rancher Security team](https://github.com/rancher/rancher/security/policy) for security related inquiries. - Open an issue in the [Rancher](https://github.com/rancher/rancher/issues/new/choose) repository. - Verify with the [support matrix](https://www.suse.com/suse-rancher/support-matrix/all-supported-versions/) and [product support lifecycle](https://www.suse.com/lifecycle/).

Advisory Timeline

  • First published May 7, 2026 (158 days ago).
  • Last revised September 10, 2026 — 126 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Go
Update github.com/rancher/rancher to 2.12.9 or later
go get github.com/rancher/rancher@v2.12.9
Go
Update github.com/rancher/rancher to 2.11.13 or later
go get github.com/rancher/rancher@v2.11.13
Go
Update github.com/rancher/rancher to 2.14.1 or later
go get github.com/rancher/rancher@v2.14.1
Go
Update github.com/rancher/rancher to 2.13.5 or later
go get github.com/rancher/rancher@v2.13.5

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (4)

Affects 1 ecosystem: go (1).

PackageEcosystemAffectedFixed In
github.com/rancher/rancher
go
All versions2.12.9
github.com/rancher/rancher
go
All versions2.11.13
github.com/rancher/rancher
go
All versions2.14.1
github.com/rancher/rancher
go
All versions2.13.5

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.4 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-25705?
Rancher Extensions have arbitrary file access via path traversal This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.4/10).
How do I check if my project is affected by CVE-2026-25705?
CVE-2026-25705 affects github.com/rancher/rancher. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-25705 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.4

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-5v3h-x4wf-5c35
GO-2026-5154

Related CVEs

Check if you're affected

Scan your dependencies to see if this vulnerability affects your projects.

Scan Your Dependencies