CVE-2026-42875

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.

Affected packages (1)

• Go/github.com/external-secrets/external-secretsfrom 0, < 2.4.0

CVSS scores

References (3)

• ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-42875
• PATCHhttps://github.com/external-secrets/external-secrets
• WEBhttps://github.com/external-secrets/external-secrets/security/advisories/GHSA-wv26-88m5-6h59