CVE-2026-13218 | A flaw was found in KubeVirt's virt-handler network cache ha… | CVSS 4.2 MEDIUM

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.

Metadata

CVE ID: CVE-2026-13218
State: PUBLISHED
Assigner: redhat
Reserved: 2026-06-24 15:29 UTC
Published: 2026-06-25 23:23 UTC
Last updated: 2026-06-25 23:23 UTC
Primary CWE: CWE-61
UNIX Symbolic Link (Symlink) Following
Vendor / Product: Red Hat / Red Hat OpenShift Virtualization 4
Sources: cve.org · NVD

Severity & Metrics

4.2 MEDIUM CVSS 3.1

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

Affected products (2)

Vendor	Product	Platform	Versions
Red Hat	Red Hat OpenShift Virtualization 4	—	—
Red Hat	Red Hat OpenShift Virtualization 4	—	—

Weakness (CWE)

CWE	Source	Description
CWE-61	cna	UNIX Symbolic Link (Symlink) Following

CVSS scores (1)

Score	Severity	Version	Source	Vector
4.2	MEDIUM	3.1	cna	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L

References (2)