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CVE-2026-13218

Kubevirt: kubevirt: symlink following in writetocachedfile allows host file overwrite from virt-launcher

Published: Jun 25, 2026Updated: Jul 6, 2026 Sources: CVE List NVDCWE-61
4.2MEDIUM
NVD MITRE
EPSS Score
0.1%
Top 98.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:HPR:LUI:NS:CC:NI:LA:L
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-61

Affected Products

Red Hat
commercial·USaka redhat
openshift virtualizationOn-prem
Operating Systems / linux-distro
Red Hat OpenShift Virtualization 4SaaSSaaS Service
Cloud & SaaS / virtualization
kubevirt
oss-projectaka containerized data importer, containerized-data-importer
kubevirtMixed
Cloud & SaaS / container-orchestration

Exploitability

Official Patch Available
Workaround Available

References

https://access.redhat.com/security/cve/CVE-2026-13218
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2492654
bugzilla.redhat.com

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