CVE-2026-122313

Critical

Description

Kyverno from 1.17.0 before 1.19.2 contains a privilege escalation vulnerability that allows namespace-scoped tenants to modify resources in other namespaces through NamespacedMutatingPolicy targetMatchConstraints.expression CEL output lacking namespace checks. Attackers can emit a literal target such as another tenant's RoleBinding, which the cluster-wide background controller then mutates to add attacker subjects or alter Roles, NetworkPolicies, and ConfigMaps.

SeverityCritical

CVSS9.9

Exploit probability24. percentile0.3%

ProductKyverno

PublishedNov 5, 2026

First seenNov 5, 2026

Weakness typeCWE-269Improper privilege management

How to fix

Update

kyverno kyverno1.19.2 or later

Vendor advisories

github.com/kyverno/kyverno/security/advisories/GHSA-f96w-622v-rqpq

Affected products

Product	Affected versions	Fixed in
kyverno kyverno	1.17.0 ≤ v < 1.19.2	1.19.2

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