CVE-2026-122309 PUBLISHED

Kyverno before 1.19.2 Denial of Service via Unbounded CEL Policy Evaluation Cost

Assigner: VulnCheck
Reserved: 04.11.2026 Published: 05.11.2026 Updated: 05.11.2026

Kyverno before 1.19.2 contains a denial of service vulnerability that allows namespace-scoped policy authors to exhaust CPU and memory by submitting CEL expressions evaluated without runtime cost limits. Attackers can create a NamespacedValidatingPolicy or NamespacedDeletingPolicy with nested map comprehensions over large ConfigMap fields to OOM-kill Kyverno pods and block cluster-wide admission.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
CVSS Score: 8.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	High
User Interaction	Passive

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:N/I:N/A:H
CVSS Score: 6.2

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	High	Integrity Impact	None
User Interaction	Required	Availability Impact	High

CVSS 3.1

Product Status

Vendor	kyverno
Product	kyverno
Versions	Default: unaffected affected from 0 to 1.19.2 (excl.) Version 1.19.2 is unaffected

CVE-2026-122309 PUBLISHED

Kyverno before 1.19.2 Denial of Service via Unbounded CEL Policy Evaluation Cost

Metrics

Product Status

Credits

References

Problem Types