In short
- CVE-2026-42875 is a MEDIUM (CVSS 5.3) vulnerability affecting github.com/external-secrets/external-secrets.
- Chance of exploitation in the next 30 days (EPSS): 0.24%, higher than 15.2% of all vulnerabilities.
- Fix: update to 2.4.0 or later.
Description
Impact
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.
The accessible data is used as CA validation material, hence it is not directly exposed.
Impact:
- Direct data exfiltration risk: low
- Existence disclosure: an attacker can infer whether a target ConfigMap/key exists in another namespace.
- Trust-boundary violation: a tenant can make its SecretStore consume CA material owned by another namespace.
NVD description
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.
More vulnerabilities in github.com/external-secrets/external-secrets
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