{"id":"CVE-2026-77459","summary":"Argo CD: AppProject destination-namespace and resource restrictions bypassed by PreDelete/PostDelete resource hooks","details":"Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. From 2.10.0 until 3.3.15, 3.4.10, 3.5.4, and 3.6.0-rc2, Argo CD creates PostDelete resource hooks without applying the AppProject destination and resource authorization checks used during ordinary synchronization. The omitted checks include cluster-scoped and namespaced resource allow/deny lists. A user who can write to an Application's Git repository can commit a delete hook targeting a forbidden namespace, server, group, kind, or resource name, and deletion of the Application causes the application-controller to create that resource with its destination-cluster credentials. The reachable impact is bounded by the controller's cluster access but can include cluster-scoped resources, disallowed namespaces, persistent hook objects, and secondary objects created by a hook Job. PreSync, Sync, PostSync, and SyncFail hooks continue to use the normal project checks. This issue is fixed in versions 3.3.15, 3.4.10, 3.5.4, and 3.6.0-rc2.","aliases":["GHSA-fmxq-cgp8-87wp"],"modified":"2026-10-14T10:47:01.949269136Z","published":"2026-10-13T16:26:47.088Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77459.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-863"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77459.json"},{"type":"FIX","url":"https://github.com/argoproj/argo-cd/commit/1149cdc6e932208c4402183cc3d7b7485239940c"},{"type":"FIX","url":"https://github.com/argoproj/argo-cd/commit/4bc8085b0a6d2296b849539d3d09fc7be7a4a511"},{"type":"FIX","url":"https://github.com/argoproj/argo-cd/commit/7f0a05834b05103d69d7c150e1ee36541b314696"},{"type":"FIX","url":"https://github.com/argoproj/argo-cd/commit/d5dd7019ee65be8895133fe4df554e28074242c4"},{"type":"WEB","url":"https://github.com/argoproj/argo-cd/releases/tag/v3.3.15"},{"type":"WEB","url":"https://github.com/argoproj/argo-cd/releases/tag/v3.4.10"},{"type":"WEB","url":"https://github.com/argoproj/argo-cd/releases/tag/v3.5.4"},{"type":"WEB","url":"https://github.com/argoproj/argo-cd/releases/tag/v3.6.0-rc2"},{"type":"ADVISORY","url":"https://github.com/argoproj/argo-cd/security/advisories/GHSA-fmxq-cgp8-87wp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77459"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/argoproj/argo-cd","events":[{"introduced":"2175939ed6156ddd743e60f427f7f48118c971bf"},{"last_affected":"206a6eeca509bbf7f239301f3d3fa498c23251a4"},{"introduced":"e98f483bfd5781df2592fef1aeed1148f150d9c9"},{"fixed":"a7d718da2e77e6fe9e3d58cd788b5cdaa6b215fe"},{"introduced":"f082e49f6cea81ac91b620216cbe90311cafa2d4"},{"fixed":"58c8bc04d3f14568d817cd9e3a525f313c295c01"},{"introduced":"e95e1be88a2da6c06bff5c2fe1791e4d233ed810"},{"fixed":"d6d5b248ce00e1a2c512068002a93d3319767087"},{"introduced":"b7e3f52c2827c5c9e0dd41d71b292bbeb66010be"},{"fixed":"f922b44b5d17765910e31a583dfb253d75afebe6"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"2.10.0"},{"last_affected":"2.14.21"},{"introduced":"3.0.0"},{"fixed":"3.3.15"},{"introduced":"3.4.0"},{"fixed":"3.4.10"},{"introduced":"3.5.0"},{"fixed":"3.5.4"},{"introduced":"3.6.0-rc1"},{"fixed":"3.6.0-rc2"}]}}],"versions":["v3.6.0-rc1","gitops-engine/v3.6.0-rc1","v3.5.3","v3.4.9","v3.5.2","v3.4.8","v3.4.7","v3.5.1","v3.4.6","v3.5.0","v3.4.5","v3.4.4","v3.4.3","v3.4.2","v3.4.1","v3.4.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77459.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}]}