# CVE-2026-122311: Kyverno 1.16.0 before 1.19.2 Path Traversal in Namespaced CEL Policies via resource argument

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

Kyverno from 1.16.0 before 1.19.2 fails to validate path segments in the resource argument of resource.get() and resource.post(), allowing namespaced CEL policies to escape their namespace. Tenants who can create a NamespacedValidatingPolicy can insert .. segments to read and write arbitrary cluster objects using the admission controller's ServiceAccount, leading to cluster takeover.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- kyverno / kyverno (github.com/kyverno/kyverno): ≥ 1.16.0; < 1.19.2 (affected, semver); 1.19.2 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 9.4 (critical); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H; source: CNA: VulnCheck

- CVSS 3.1: 9.9 (critical); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-22

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/kyverno/kyverno/security/advisories/GHSA-4pqm-wqq6-h9q2 (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/kyverno-1.16.0-before-1.19.2-path-traversal-in-namespaced-cel-policies-via-resource-argument (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-122311; retrieved 2026-11-05; source updated 2026-11-05

Revision: e27f1ae455e1dbbcb17bbce73573d5479e1c1d0808a5c1eff280311344860610

Canonical: https://y2.dev/cve/CVE-2026-122311

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