CVE-2026-13218
Last modified
CVE-2026-13218 is a medium-severity vulnerability rated 4.2/10 on the CVSS scale. 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. EPSS estimates a 0.10% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Kubevirt | Kubevirt | All versions |
| Redhat | Openshift Virtualization | >= 4, <= 4.22.0 |
References
- https://access.redhat.com/security/cve/CVE-2026-13218Vendor Advisory, Mitigation
- https://bugzilla.redhat.com/show_bug.cgi?id=2492654Issue Tracking, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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