CVE-2026-13218
Kubevirt: kubevirt: symlink following in writetocachedfile allows host file overwrite from virt-launcher
- State
- Published
- Severity
- 4.2 Medium
- Published
- Jun 25, 2026
- Updated
- Jun 26, 2026
- Reserved
- Jun 24, 2026
Description
A flaw was found in KubeVirt's virt-handler network cache handling. The WriteToCachedFile function writes data to a launcher-rooted path using os.WriteFile and os.Chown without symlink protection. A user with access to the virt-launcher container can plant a symlink at the cache file path, causing virt-handler to follow it and overwrite an arbitrary host file with JSON content and change its ownership.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.2 Medium | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L | redhat |
Weaknesses
- CWE-61 UNIX Symbolic Link (Symlink) Following
Affected Products
| Product | Versions |
|---|---|
Red Hat OpenShift Virtualization 4Red Hat | |
Red Hat OpenShift Virtualization 4Red Hat |
References
- https://access.redhat.com/security/cve/CVE-2026-13218vdb-entry
- RHBZ#2492654issue-tracking
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