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Vulnerabilities

Vulnerability · CVE-2026-13218

KubeVirt virt-handler network cache symlink vulnerability allows arbitrary host file overwrite

Published Jun 26, 2026 · catalog updated Nov 4, 2026 · KubeVirt virt-handler network cache

Last checked Nov 7, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-13218. EPSS is 0.14%. Act only if a listed version of KubeVirt virt-handler network cache is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (KubeVirt virt-handler network cache).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.14%
Remediation
Advisory link
Affected products
Go kubevirt.io/kubevirt

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Go kubevirt.io/kubevirt0 → 1.10.0-rc.0

How to fix CVE-2026-13218

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-13218. EPSS is 0.14%. Act only if a listed version of KubeVirt virt-handler network cache is installed.

Which versions are affected?

Compare what you have installed with 0 → 1.10.0-rc.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-61. EPSS 0.14%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 26, 2026 · GitHub Advisory Database

    Detected

    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 owner

  2. Nov 4, 2026 · GitHub Advisory Database

    Fix available

    kubevirt.io/kubevirt fixed in 1.10.0-rc.0

  3. Nov 4, 2026 · GitHub Advisory Database

    Updated

    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 owner

Sources

References

Freshness

Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Go Vulnerability DatabaseNov 5, 2026
  • GitHub Advisory DatabaseNov 5, 2026
  • OpenSSF OSV / OSV ScannerNov 5, 2026
  • CVE.orgNov 4, 2026