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Critical · 9.9 CVE-2026-77459 BIT-argo-cd-2026-77459EUVD-2026-98917GHSA-fmxq-cgp8-87wpGO-2026-6784

Argo CD: AppProject destination-namespace and resource restrictions bypassed by PreDelete/PostDelete resource hooks

Published Oct 13, 2026 · Updated Oct 14, 2026 · Assigned by GitHub_M

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

VendorProductAffectedFixed
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

ReleasePackageFixed inAdvisory
Wolfi rolling argo-cd-3.2 +1 No fix yet —

Affected packages

EcosystemPackageAffectedFixedRecord
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

References