# CVE-2026-122312: Kyverno 1.19.1 before 1.19.2 Namespace Isolation Bypass via APICall URLPath Query String

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

Kyverno from 1.19.1 before 1.19.2 contains a namespace isolation bypass in APICall Fetch() in pkg/engine/apicall/apiCall.go because path.Clean treats '?' as a path character, letting the namespace regex match segments inside the query string. Users who can create namespaced policies can supply a URLPath like /api/v1/nodes?x=/namespaces/default/ that passes validation while client-go requests the cluster-scoped endpoint, reading resources outside their namespace.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/kyverno/kyverno/commit/f67231def576eb0ad153dd8cbfc836908ab14c14

## Affected products and versions

- kyverno / kyverno (github.com/kyverno/kyverno): ≥ 1.19.1; < 1.19.2 (affected, semver); 1.19.2 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.3 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.7 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-269

## Exploit evidence

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

## References

- https://github.com/kyverno/kyverno/security/advisories/GHSA-pcx2-xcq4-65vf (CNA: VulnCheck; vendor-advisory)

- https://github.com/kyverno/kyverno/commit/f67231def576eb0ad153dd8cbfc836908ab14c14 (CNA: VulnCheck; patch)

- https://www.vulncheck.com/advisories/kyverno-1.19.1-before-1.19.2-namespace-isolation-bypass-via-apicall-urlpath-query-string (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-122312; retrieved 2026-11-05; source updated 2026-11-05

Revision: 4c34cdfaebbd4c9c434699667489d16b61b8f80464643ae44628713a27ad65e3

Canonical: https://y2.dev/cve/CVE-2026-122312

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