Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| argoproj | argo-cd | >= 2.10.0, <= 2.14.21, >= 3.0.0, < 3.3.15, >= 3.4.0, < 3.4.10, >= 3.5.0, < 3.5.4, >= 3.6.0-rc1, < 3.6.0-rc2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | argo-cd-3.2 +1 | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/argoproj/argo-cd | all versions | — | GO-2026-6784 |
| Go | github.com/argoproj/argo-cd/v2 | >= 2.10.0, <= 2.14.21 | — | GHSA-fmxq-cgp8-87wp |
| Go | github.com/argoproj/argo-cd/v2 | >= 2.10.0 | — | GO-2026-6784 |
| Go | github.com/argoproj/argo-cd/v3 | >= 3.0.0, < 3.3.15 | 3.3.15 | GHSA-fmxq-cgp8-87wp |
| Go | github.com/argoproj/argo-cd/v3 | >= 3.4.0, < 3.4.10 | 3.4.10 | GHSA-fmxq-cgp8-87wp |
| Go | github.com/argoproj/argo-cd/v3 | >= 3.5.0, < 3.5.4 | 3.5.4 | GHSA-fmxq-cgp8-87wp |
| Go | github.com/argoproj/argo-cd/v3 | >= 3.6.0-rc1, < 3.6.0-rc2 | 3.6.0-rc2 | GHSA-fmxq-cgp8-87wp |
| Go | github.com/argoproj/argo-cd/v3 | >= 3.0.0, < 3.3.15 · >= 3.4.0, < 3.4.10 · >= 3.5.0, < 3.5.4 · >= 3.6.0-rc1, < 3.6.0-rc2 | 3.3.15, 3.4.10, 3.5.4, 3.6.0-rc2 | GO-2026-6784 |
Advisories 1
- WID-SEC-2026-3802 Argo CD: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 2, 2026
References
- https://github.com/argoproj/argo-cd/security/advisories/GHSA-fmxq-cgp8-87wp
- https://github.com/argoproj/argo-cd/commit/1149cdc6e932208c4402183cc3d7b7485239940c
- https://github.com/argoproj/argo-cd/commit/4bc8085b0a6d2296b849539d3d09fc7be7a4a511
- https://github.com/argoproj/argo-cd/commit/7f0a05834b05103d69d7c150e1ee36541b314696
- https://github.com/argoproj/argo-cd/commit/d5dd7019ee65be8895133fe4df554e28074242c4
- https://github.com/argoproj/argo-cd/releases/tag/v3.3.15
- https://github.com/argoproj/argo-cd/releases/tag/v3.4.10
- https://github.com/argoproj/argo-cd/releases/tag/v3.5.4
- https://github.com/argoproj/argo-cd/releases/tag/v3.6.0-rc2