Denial of Service Vulnerability in Kyverno by Nirmata
CVE-2026-122306

8.3HIGH

Key Information:

Vendor

Kyverno

Status
Kyverno
Vendor
CVE Published:
5 November 2026

What is CVE-2026-122306?

Kyverno, a policy engine for Kubernetes, is susceptible to a denial of service vulnerability that arises due to improper handling of wildcard patterns. Authors of namespaced policies can exploit this flaw by submitting specifically crafted policy configurations. This triggers excessive resource consumption, pinning CPU cores and leading to cluster-wide webhook timeouts. Such conditions can significantly impair resource operations, ultimately disrupting the functionality of Kubernetes clusters.

Affected Version(s)

kyverno 0 < 1.19.2

kyverno 1.19.2

References

https://github.com/kyverno/kyverno/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/kyverno-before-1.19....
third-party-advisory

CVSS V4

Score:
8.3
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

1diot9
.