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🛡️ CVE-2026-25705 — rancher

🟠 CVSS 8.4 — High ✅ No Known Exploit CWE-35 NVD
8.4
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Rancher Extensions have arbitrary file access via path traversal

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/).

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: High — administrative rights are needed first.
  • User interaction: Required — someone has to click, open or visit something.
  • Scope: Changed — a successful attack reaches components beyond the vulnerable one.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2026-25705 is classified as CWE-35: Path Traversal: '.../...//'. The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize '.../...//' (doubled triple dot slash) sequences that can resolve to a location that is outside of that directory.

Affected software

CVE-2026-25705 is recorded against 2 packages.

  • github.com/rancher/rancher
  • unknown

Timeline and source

Published on 7 May 2026 and last revised on 2 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
bugzilla.suse.com (Web)
github.com (Package)

Other advisories for this package

github.com/rancher/rancher has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-35: Path Traversal: '.../...//') in other software:

Details

Severity HIGH
CVSS Score 8.4
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
CWE CWE-35
Public Exploit ✅ No
Source NVD
Published 2026-05-07
Updated 2026-08-20
Modified 2026-07-02
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/rancher/rancher — —
unknown — —

Similar Threats

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