Bug 2527697 (CVE-2026-84200)

Summary:	CVE-2026-84200 Kyverno: Kyverno before v1.13.0 Policy Bypass via Multiple Exceptions
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	gbenhaim, niyer, twaugh
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in Kyverno. This policy exception handling flaw allows a remote attacker to bypass security policies. By crafting a resource name that matches a less restrictive exception pattern, an attacker can circumvent policies, such as those blocking hostPath volumes, leading to unauthorized actions within the system.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2026-09-02 18:12:16 UTC

Kyverno versions v1.9.0 through v1.12.7 contain a policy exception handling flaw. When a policy in enforce mode is combined with two PolicyExceptions, the less restrictive exception takes precedence, allowing an attacker to bypass the policy by crafting a resource name that matches the second exception's name pattern (e.g., '*ingress*'). This can be used to circumvent policies such as one blocking hostPath volumes. Fixed in v1.13.0.