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TI-2026-11224 Aliases CVE-2026-13218GHSA-q3jc-42cq-33fj

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

Priority LOW 19CWE-61Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
None · Low · Low
Fix status
Deferred Red Hat: fix deferred

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00139 3rd percentileScored 2026-11-07
Fix Deferred Red Hat: fix deferred

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat OpenShift Virtualization 4——No fix listedCNA
Red HatRed Hat OpenShift Virtualization 4——No fix listedCNA
—kubevirt.io/kubevirt (Go)up to 1.10.0-rc.0—No fix listedGHSA-q3jc-42cq-33fj
  • Red Hat OpenShift Virtualization 4 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat OpenShift Virtualization 4 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • kubevirt.io/kubevirt (Go) Vendor— Affected up to 1.10.0-rc.0 Fixed in — No fix listed GHSA-q3jc-42cq-33fj

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:kubevirt:kubevirt:-:*:*:*:*:kubernetes:*:*not specified by NVDVulnerablekubevirt
cpe:2.3:a:redhat:openshift_virtualization:*:*:*:*:*:*:*:*4 – 4.22.0VulnerableRed Hat
  • cpe:2.3:a:kubevirt:kubevirt:-:*:*:*:*:kubernetes:*:* Versions not specified by NVD Vulnerable ·kubevirt
  • cpe:2.3:a:redhat:openshift_virtualization:*:*:*:*:*:*:*:* Versions 4 – 4.22.0 Vulnerable ·Red Hat

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenShift Virtualization 4AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-13218
  2. 2026-10-03 Alias added: GHSA-q3jc-42cq-33fj
  3. 2026-11-04 Affected versions changed · GHSA-q3jc-42cq-33fj
  4. 2026-11-04 CVSS score added · GHSA-q3jc-42cq-33fj
  5. 2026-11-04 Weakness changed · GHSA-q3jc-42cq-33fj
  6. 2026-11-04 5 new references · GHSA-q3jc-42cq-33fj

References

Advisory 3

Other 2

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2023-26623 The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6… CVSS 3.1MEDIUM 5.9
  • TI-2026-32429 Axios: Credential Theft and Response Hijacking via Prototype Pollution Gadget in Config Merge CVSS 3.1HIGH 7.7
  • TI-2026-23208 Immutable.js: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in immutable CVSS 4.0HIGH 8.7
  • TI-2020-11187 Improper privilege management in kubevirt CVSS 3.1CRITICAL 9.9
  • TI-2026-11209 Kubevirt: virt-handler-rhel9: kubevirt: safepath symlink following in virt-handler… CVSS 3.1HIGH 7.3
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences