Argo CD: AppProject destination-namespace and resource restrictions bypassed by PreDelete/PostDelete resource hooks
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-77459
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 8 Nov 2026, 02:31 UTC · Revision 1
Source evidence
Argo CD: AppProject destination-namespace and resource restrictions bypassed by PreDelete/PostDelete resource hooks
core-osv · Original sourcePublished 13 Oct 2026, 16:26 UTC
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.
osv:CVE-2026-77459
Complete source record
{
"id": "857b34c440ec4a8f12c8ed8250ce90e64b998232f0f98bee7ee7cdd19afda25f",
"url": "https://osv.dev/vulnerability/CVE-2026-77459",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Argo CD: AppProject destination-namespace and resource restrictions bypassed by PreDelete/PostDelete resource hooks",
"summary": "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.",
"evidence": "osv:CVE-2026-77459",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-77459",
"aliases": [
"BIT-argo-cd-2026-77459",
"CVE-2026-77459",
"GHSA-fmxq-cgp8-87wp",
"GO-2026-6784"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/argoproj/argo-cd",
"type": "GIT",
"events": [
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"introduced": "2175939ed6156ddd743e60f427f7f48118c971bf"
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{
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},
{
"introduced": "e98f483bfd5781df2592fef1aeed1148f150d9c9"
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{
"fixed": "a7d718da2e77e6fe9e3d58cd788b5cdaa6b215fe"
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{
"introduced": "f082e49f6cea81ac91b620216cbe90311cafa2d4"
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{
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{
"fixed": "f922b44b5d17765910e31a583dfb253d75afebe6"
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{
"fixed": "1149cdc6e932208c4402183cc3d7b7485239940c"
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{
"fixed": "4bc8085b0a6d2296b849539d3d09fc7be7a4a511"
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{
"fixed": "7f0a05834b05103d69d7c150e1ee36541b314696"
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{
"fixed": "d5dd7019ee65be8895133fe4df554e28074242c4"
}
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"database_specific": {
"extracted_events": [
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"range": [
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"introduced": "2.10.0"
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{
"last_affected": "2.14.21"
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],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
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{
"range": [
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"introduced": "3.0.0"
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{
"fixed": "3.3.15"
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"source": "AFFECTED_FIELD",
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{
"range": [
{
"introduced": "3.4.0"
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{
"fixed": "3.4.10"
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"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
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{
"range": [
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"introduced": "3.5.0"
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{
"fixed": "3.5.4"
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"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
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"introduced": "3.6.0-rc1"
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{
"fixed": "3.6.0-rc2"
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"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
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"fixed": "1149cdc6e932208c4402183cc3d7b7485239940c"
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],
"source": "REFERENCES_COMMIT"
},
{
"range": [
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"source": "REFERENCES_COMMIT"
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{
"range": [
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"source": "REFERENCES_COMMIT"
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{
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"source": "REFERENCES_COMMIT"
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{
"range": [
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"fixed": "a7d718da2e77e6fe9e3d58cd788b5cdaa6b215fe"
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],
"source": "REFERENCES_TAG",
"original_tag": "v3.3.15"
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{
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"source": "REFERENCES_TAG",
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{
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"source": "REFERENCES_TAG",
"original_tag": "v3.5.4"
},
{
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],
"source": "REFERENCES_TAG",
"original_tag": "v3.6.0-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",
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"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"
}
}
],
"modified": "2026-10-28T02:30:52.779681680Z",
"provider": "osv",
"references": [
"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",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77459.json",
"https://github.com/argoproj/argo-cd/security/advisories/GHSA-fmxq-cgp8-87wp",
"https://nvd.nist.gov/vuln/detail/CVE-2026-77459",
"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"
],
"provider_metadata": {
"cwe_ids": [
"CWE-863"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77459.json"
}
},
"related_cves": [
{
"value": "CVE-2026-77459",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 521809,
"published_at": "2026-10-13T16:26:47.088+00:00"
}