Bug 2469310 (CVE-2026-42875)

Summary: CVE-2026-42875 external-secrets: External Secrets Operator: Namespace boundary bypass allows unauthorized access to CA material
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in External Secrets Operator. Namespaced SecretStore resources configured with CAProvider of type ConfigMap, when caProvider.namespace is set, could resolve Certificate Authority (CA) material from other namespaces. This bypasses the intended namespace boundary, potentially allowing an attacker to gain unauthorized access to sensitive CA material.
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Description OSIDB Bzimport 2026-05-11 20:06:15 UTC 
External Secrets Operator reads information from a third-party service and automatically injects the values as Kubernetes Secrets. Prior to 2.4.0, Namespaced SecretStore resources that used CAProvider with type ConfigMap could resolve CA material from another namespace when caProvider.namespace was set. This bypassed the namespace boundary enforced for SecretStore-backed references in providers that rely on the shared runtime CA resolver. This vulnerability is fixed in 2.4.0.