Vulnerability · Published Jun 26, 2026 · Assigned by redhat

CVE-2026-13322Kubevirt: virt-handler-rhel9: kubevirt: unbounded virtio-serial readline in virt-handler causes oom denial of service

Low 3.8

In plain English

A low-severity resource allocation without limits in Red Hat OpenShift Virtualization 4 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 3.1)3.8Low

Exploit odds (30 days)0.1%top 97.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A flaw was found in KubeVirt's downward metrics virtio-serial server. The server reads guest requests using textproto.Reader.ReadLine(), which buffers input indefinitely until a newline character is received, with no length limit or read deadline. A user with access to a VM guest that has the downward metrics virtio-serial device configured can write a continuous byte stream to the device, causing unbounded memory allocation in the virt-handler process until it is OOM-killed.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/kubevirt/kubevirt	no fix listed	GHSA-6f2p-2qg2-qqch
Go	kubevirt.io/kubevirt	no fix listed	GO-2026-6912

Affected products (as reported)

Vendor	Product	Versions
Red Hat	Red Hat OpenShift Virtualization 4	see references
Red Hat	Red Hat OpenShift Virtualization 4	see references

Weakness: CWE-770 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L

References

https://access.redhat.com/security/cve/CVE-2026-13322 vdb-entry, x_refsource_REDHAT
RHBZ#2492681 issue-tracking, x_refsource_REDHAT