Kyverno before 1.19.2 contains a denial of service vulnerability in substituteVariablesIfAny that allows low-privileged users to hang the admission webhook via self-referential variable templates. Attackers can create resources whose annotations re-introduce the embedded policy variable, causing unbounded substitution loops that exhaust CPU and memory and block cluster-wide admission.

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Thu, 05 Nov 2026 02:45:00 +0000

Type Values Removed Values Added
Description Kyverno before 1.19.2 contains a denial of service vulnerability in substituteVariablesIfAny that allows low-privileged users to hang the admission webhook via self-referential variable templates. Attackers can create resources whose annotations re-introduce the embedded policy variable, causing unbounded substitution loops that exhaust CPU and memory and block cluster-wide admission.
Title Kyverno before 1.19.2 Denial of Service via Nested Variable Substitution Loop
First Time appeared Kyverno
Kyverno kyverno
Weaknesses CWE-835
CPEs cpe:2.3:a:kyverno:kyverno:*:*:*:*:*:*:*:*
Vendors & Products Kyverno
Kyverno kyverno
References
Metrics cvssV3_1

{'score': 7.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-05T02:25:09.571Z

Reserved: 2026-11-04T23:23:51.290Z

Link: CVE-2026-122305

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-05T03:17:22.527

Modified: 2026-11-05T03:17:22.527

Link: CVE-2026-122305

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-05T04:00:14Z

Weaknesses