CVE-2026-77459Argo CD: AppProject destination-namespace and resource restrictions bypassed by PreDelete/PostDelete resource hooks
- 9.9CriticalCVSS base score
- 0.50%Exploitation in 30 daysEPSS · top 57% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By GitHub_M
- 54 days later
· 54 days later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Critical9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Undergoing Analysis | 3.1 | Critical9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.50% · top 57% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.9.
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/argoproj/argo-cd/v2GHSA-fmxq-cgp8-87wp (opens in a new tab)
- Gogithub.com/argoproj/argo-cd/v3GHSA-fmxq-cgp8-87wp (opens in a new tab)
References
References9
- https://github.com/argoproj/argo-cd/security/advisories/GHSA-fmxq-cgp8-87wp (opens in a new tab)x_refsource_CONFIRM
- https://github.com/argoproj/argo-cd/commit/1149cdc6e932208c4402183cc3d7b7485239940c (opens in a new tab)x_refsource_MISC
- https://github.com/argoproj/argo-cd/commit/4bc8085b0a6d2296b849539d3d09fc7be7a4a511 (opens in a new tab)x_refsource_MISC
- https://github.com/argoproj/argo-cd/commit/7f0a05834b05103d69d7c150e1ee36541b314696 (opens in a new tab)x_refsource_MISC
- https://github.com/argoproj/argo-cd/commit/d5dd7019ee65be8895133fe4df554e28074242c4 (opens in a new tab)x_refsource_MISC
- https://github.com/argoproj/argo-cd/releases/tag/v3.3.15 (opens in a new tab)x_refsource_MISC
- https://github.com/argoproj/argo-cd/releases/tag/v3.4.10 (opens in a new tab)x_refsource_MISC
- https://github.com/argoproj/argo-cd/releases/tag/v3.5.4 (opens in a new tab)x_refsource_MISC
- https://github.com/argoproj/argo-cd/releases/tag/v3.6.0-rc2 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-98917 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-fmxq-cgp8-87wp (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-77459)Record last updated .