{"id":"GHSA-wv26-88m5-6h59","summary":"External Secrets Operator has Namespace Isolation Bypass in CAProvider ConfigMap Resolution for SecretStore","details":"### Impact\n\nNamespaced SecretStore resources that used CAProvider with type `ConfigMap` could resolve CA material from another namespace when `caProvider.namespace` was set. \nThis bypassed the namespace boundary enforced for SecretStore-backed references in providers that rely on the shared runtime CA resolver. \n\nThe accessible data is used as CA validation material, hence it is not directly exposed.\n\nImpact:\n- Direct data exfiltration risk: low\n- Existence disclosure: an attacker can infer whether a target ConfigMap/key exists in another namespace.\n- Trust-boundary violation: a tenant can make its SecretStore consume CA material owned by another namespace.","aliases":["CVE-2026-42875","GO-2026-5723"],"modified":"2026-07-17T21:08:11.708024760Z","published":"2026-05-05T18:37:12Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-05-05T18:37:12Z","nvd_published_at":"2026-05-11T20:25:44Z","cwe_ids":["CWE-285","CWE-668"]},"references":[{"type":"WEB","url":"https://github.com/external-secrets/external-secrets/security/advisories/GHSA-wv26-88m5-6h59"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42875"},{"type":"PACKAGE","url":"https://github.com/external-secrets/external-secrets"}],"affected":[{"package":{"name":"github.com/external-secrets/external-secrets","ecosystem":"Go","purl":"pkg:golang/github.com/external-secrets/external-secrets"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.4.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-wv26-88m5-6h59/GHSA-wv26-88m5-6h59.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"}]}