CVE-2026-13434

MEDIUMPre-NVD 4.94.9—
EchelonGraph scoreHIGH confidence

Score 4.9 from GitHub Security Advisory published 2026-06-26. a secondary CVSS source baseline 4.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.9Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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).

CVSS v3
4.9
EG Score
4.9(high)
EPSS
4.8%
KEV
Not listed

Published

June 26, 2026

Last Modified

July 6, 2026

Advisory Details (2)

Auto-updated Jun 26, 2026
Patch available. Sources: redhat.
redhat

2493576 – (CVE-2026-13434) CVE-2026-13434 virt-controller-rhel9: kubevirt: kubevirt: Multus default-network annotation injection via unvalidated tenant networkName when ExternalNetResourceInjection is enabled

https://bugzilla.redhat.com/show_bug.cgi?id=2493576
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-13434

Vendor Advisories for CVE-2026-13434(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 22× in last 7d / 34× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 14:19 UTCEG score recompute
  3. 2026-07-06 14:19 UTCGHSA enrichment
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 14:41 UTCEG score recompute
  6. 2026-07-05 14:40 UTCGHSA enrichment
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 14:54 UTCEG score recompute
  10. 2026-07-04 14:54 UTCGHSA enrichment
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-03 15:15 UTCEG score recompute
  13. 2026-07-03 15:15 UTCGHSA enrichment
  14. 2026-07-02 15:36 UTCEG score recompute
  15. 2026-07-02 15:36 UTCGHSA enrichment
  16. 2026-07-01 15:56 UTCEG score recompute
  17. 2026-07-01 15:56 UTCGHSA enrichment
  18. 2026-07-01 15:06 UTCEPSS rescore
  19. 2026-07-01 15:06 UTCEPSS rescore
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 16:17 UTCEG score recompute
  22. 2026-06-30 16:17 UTCGHSA enrichment
  23. 2026-06-29 16:39 UTCEG score recompute
  24. 2026-06-29 16:39 UTCGHSA enrichment
  25. 2026-06-29 14:06 UTCEPSS rescore
Show 9 more
  1. 2026-06-28 17:00 UTCEG score recompute
  2. 2026-06-28 17:00 UTCGHSA enrichment
  3. 2026-06-28 14:07 UTCEPSS rescore
  4. 2026-06-28 04:56 UTCEPSS rescore
  5. 2026-06-28 04:56 UTCEPSS rescore
  6. 2026-06-27 17:21 UTCEG score recompute
  7. 2026-06-27 17:21 UTCGHSA enrichment
  8. 2026-06-26 17:42 UTCEG score recompute
  9. 2026-06-26 17:41 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-13434?
CVE-2026-13434 is a medium vulnerability published on June 26, 2026. 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…
When was CVE-2026-13434 disclosed?
CVE-2026-13434 was first published in the National Vulnerability Database on June 26, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13434 actively exploited?
CVE-2026-13434 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-13434?
CVE-2026-13434 has a CVSS v3 base score of 4.9 (NVD).
How do I remediate CVE-2026-13434?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13434, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-13434

Explore →

Is Your Infrastructure Affected by CVE-2026-13434?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs