Kyverno is widely used in Kubernetes policy enforcement; this flaw enables cluster-admin escalation and complete cluster compromise, a high-impact cloud-native breach.
CVE-2026-124440
Kyverno apiCall URL parsing flaw lets namespace policies escalate to cluster-admin.
do firstUpgrade to a fixed release: 1.19.2.
Is CVE-2026-124440 being exploited?
Not confirmed. CVE-2026-124440 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.55% probability of exploitation in the next 30 days.
How severe is CVE-2026-124440?
CVE-2026-124440 is rated Critical with a CVSS score of 9.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-124440?
Yes. A fix has been recorded for CVE-2026-124440. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-124440 affect?
CVE-2026-124440 affects Kyverno v1.19.1 (before v1.19.2), Kubernetes clusters running Kyverno admission-controller, Namespaces with tenant-defined Policies. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-124440?
Upgrade Kyverno to v1.19.2+, rotate credentials, audit/delete suspicious webhooks and secrets
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Namespace attacker can bypass apiCall clamp to issue cross-namespace/cluster API calls, read resources, create mutating webhooks and escalate to cluster-admin.
Immediate action required
- affected>= 1.19.1 and < 1.19.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
timeline
- 8 Nov 2026Published
- 8 Nov 2026CVE record last updated · same day later
- 9 Nov 2026Analysed by vulneraibility.com · 1 day later
also known as
- Advisorygithub.com /kyverno/kyverno/security/advisories/GHSA-39w8-hv5g-f73w
- Advisoryvulncheck.com /advisories/kyverno-1.19.1-privilege-escalation-via-apicall-namespace-clamp-bypa
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- FIRST EPSS: exploit probability and percentile
- OSV: advisory aliases and downstream package versions
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.