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  4. CVE 2026 13434 virt controller rhel9 kubevirt kubevirt multus
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Back to active CVEs
Medium · CVSS 4.9CVE-2026-13434

Virt-controller-rhel9: kubevirt: kubevirt: multus default-network annotation injection via unvalidated tenant networkname when externalnetresourceinjection is enabledCVE-2026-13434

Answer in brief

CVE-2026-13434 records a Medium severity (CVSS 4.9) vulnerability in Virt-controller-rhel9: kubevirt: kubevirt: multus default-network annotation injection via unvalidated tenant networkname when externalnetresourceinjection is enabled. The current sources do not mark it as known exploited. The current feed maps Red Hat/container-native-virtualization/virt-controller-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 4, 2026First seen by HOL Jun 26, 2026Material review Oct 25, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.9
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 4.9. 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-controller-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-controller-rhel9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/container-native-virtualization/virt-controller-rhel9.
  2. 2Review the reported fix. Source-reported workaround: If the ExternalNetResourceInjection feature gate has been enabled, disable it by removing it from the HyperConverged CR's spec.featureGates configuration. This restores the NAD lookup that blocks malformed network names. If the feature gate is required for operational reasons, restrict kubevirt.io:edit permissions to trusted users only and enforce NetworkPolicy on sensitive network segments to limit lateral movement from unauthorized attachments.

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 network annotation generator. When a tenant creates a VirtualMachineInstance with a Multus network configuration, the supplied networkName value is written verbatim into the launcher pod's v1.multus-cni.io/default-network annotation without format validation or sanitization. The only admission check rejects empty strings; no DNS-1123 format validation, JSON detection, or special character rejection is performed. When the ExternalNetResourceInjection Beta feature gate is enabled (off by default, cluster-admin only), the NAD lookup that would otherwise catch malformed names is skipped by design. A tenant with kubevirt.io:edit permissions can inject a JSON-formatted NetworkSelectionElement array specifying an arbitrary namespace, NAD name, static IP address, and MAC address. Multus on the node parses this JSON and attaches the launcher pod to the specified network attachment in any namespace, enabling cross-namespace network access and IP/MAC impersonation on network segments normally segregated from tenant workloads. The ExternalNetResourceInjection feature gate was introduced in KubeVirt v1.8.0 (first shipped in OpenShift Virtualization 4.21).

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Pocket ID: Client credentials grant allows any OIDC client to obtain tokens for arbitrary audiencesAlso CWE-20

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-20
Source
CVE List V5
Source checked
Nov 4, 2026
References
2 linked sources
Open source record