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.
Severity (CVSS)
| Base score | 4.2 |
|---|---|
| Severity | Medium |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L |
| Provided by | CNA |
Weaknesses
- CWE-61 — UNIX Symbolic Link (Symlink) Following
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat OpenShift Virtualization 4 | — |
| Red Hat | Red Hat OpenShift Virtualization 4 | — |
References
- https://access.redhat.com/security/cve/CVE-2026-13218 (vdb-entry x_refsource_REDHAT)
- https://bugzilla.redhat.com/show_bug.cgi?id=2492654 (issue-tracking x_refsource_REDHAT)
Generated from the official CVE List on 26 Jun 2026 07:05 UTC.