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  4. CVE 2026 13218 kubevirt kubevirt symlink following in
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Back to active CVEs
Medium · CVSS 4.2CVE-2026-13218

Kubevirt: kubevirt: symlink following in writetocachedfile allows host file overwrite from virt-launcherCVE-2026-13218

Answer in brief

CVE-2026-13218 records a Medium severity (CVSS 4.2) vulnerability in Kubevirt: kubevirt: symlink following in writetocachedfile allows host file overwrite from virt-launcher. The current sources do not mark it as known exploited. The current feed maps Red Hat/container-native-virtualization/virt-handler (generic), Red Hat/container-native-virtualization/virt-handler-rhel9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 25, 2026Updated Oct 25, 2026Source checked Nov 3, 2026First seen by HOL Jun 26, 2026Material review Oct 25, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.2
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 4.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/container-native-virtualization/virt-handler (generic), Red Hat/container-native-virtualization/virt-handler-rhel9 (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:kubevirt:kubevirt:-:*:*:*:*:kubernetes:*:*Not reportedNot reported
cpe:2.3:a:redhat:openshift_virtualization:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/container-native-virtualization/virt-handlergeneric*Not reported
Red Hat/container-native-virtualization/virt-handler-rhel9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/container-native-virtualization/virt-handler, Red Hat/container-native-virtualization/virt-handler-rhel9.
  2. 2Review the reported fix. Source-reported workaround: Ensure virtual machines use the default masquerade network binding mode where possible. Restrict pods/exec access on virt-launcher pods to only trusted administrators. Review and restrict NetworkAttachmentDefinition resources to limit which namespaces can configure bridge-type network interfaces.

Evidence timeline and material changes

  1. Published upstream

    Jun 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jun 26, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-61
Source
CVE List V5
Source checked
Nov 3, 2026
References
2 linked sources
Open source record