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  4. CVE 2026 13322 kubevirt virt handler rhel9 kubevirt unbounded
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Back to active CVEs
Low · CVSS 3.8CVE-2026-13322

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

Answer in brief

CVE-2026-13322 records a Low severity (CVSS 3.8) vulnerability in Kubevirt: virt-handler-rhel9: kubevirt: unbounded virtio-serial readline in virt-handler causes oom denial of service. 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 26, 2026Updated Oct 25, 2026Source checked Nov 3, 2026First seen by HOL Jun 26, 2026Material review Oct 25, 2026
Upstream Advisory

Key facts

Risk
Low · CVSS 3.8
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 3.8. 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: The downward metrics virtio-serial device must be explicitly added to a VM's specification to be present. Clusters that do not use this feature are not exposed. To reduce exposure, administrators can restrict the ability to configure downward metrics devices on tenant VMs by using an admission webhook or policy controller such as Gatekeeper/OPA.

Evidence timeline and material changes

  1. Published upstream

    Jun 26, 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 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Vulnerability due to a lack of request limits in Alosuite’s password recovery functionality.Also CWE-770

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-770
Source
CVE List V5
Source checked
Nov 3, 2026
References
2 linked sources
Open source record