Privilege Escalation Vulnerability in Kyverno by Nirmata
CVE-2026-122313

9.4CRITICAL

Key Information:

Vendor

Kyverno

Status
Kyverno
Vendor
CVE Published:
5 November 2026

What is CVE-2026-122313?

Kyverno versions prior to 1.19.2 contain a privilege escalation flaw that enables namespace-scoped tenants to manipulate resources across different namespaces. This occurs through NamespacedMutatingPolicy targetMatchConstraints.expression when output lacks proper namespace validation. As a result, attackers may leverage this vulnerability to modify or add unauthorized subjects to another tenant's RoleBinding and alter critical components like Roles, NetworkPolicies, and ConfigMaps.

Affected Version(s)

kyverno 1.17.0 < 1.19.2

kyverno 1.19.2

References

https://github.com/kyverno/kyverno/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/kyverno-1.17.0-befor...
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

manus-use
.