CVE-2025-59537 argo-cd is vulnerable to unauthenticated DoS attack via malformed Gogs webhook payload

What is CVE-2025-59537?

CVE-2025-59537 is a high-severity denial of service vulnerability in Argoproj Argo Cd, published on 1 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. Versions 1.2.0 through 1.8.7, 2.0.0-rc1 through 2.14.19, 3.0.0-rc1 through 3.2.0-rc1, 3.1.7 and 3.0.18 are vulnerable to malicious API requests which can crash the API server and cause denial of service to legitimate clients. With the default configuration, no webhook.gogs.secret set, Argo CD’s /api/webhook endpoint will crash the entire argocd-server process when it receives a Gogs push event whose JSON field commits[].repo is not set or is null. This issue is fixed in versions 2.14.20, 3.2.0-rc2, 3.1.8 and 3.0.19.

Weakness: CWE-476, CWE-20

Which versions are affected by CVE-2025-59537?

14 open source packages ship an affected version, including github.com/argoproj/argo-cd/v3, argo-cd and github.com/argoproj/argo-cd. It affects 1 product.

Products include Argoproj Argo Cd.

How do I fix CVE-2025-59537?

Upgrade github.com/argoproj/argo-cd/v3 to a fixed version for your release line: 3.0.19, 3.1.8 or 3.2.0-rc2.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2025-59537 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-59537 exists.

Other vulnerabilities in Argoproj Argo Cd

• CVE-2025-55190 Argo CD: Project API Token Exposes Repository Credentials Critical 10.0
• CVE-2022-29165 Argo CD will blindly trust JWT claims if anonymous access is enabled Critical 10.0
• CVE-2023-40029 Cluster secret might leak in cluster details page in Argo CD Critical 9.9
• CVE-2022-24768 Improper access control allows admin privilege escalation in Argo CD Critical 9.9
• CVE-2024-21652 Argo CD vulnerable to Bypassing of Brute Force Protection via Application Crash and In-Memory Data Loss Critical 9.8

All Argoproj Argo Cd vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-argo-cd-2025-59537, CLEANSTART-2026-ZP55576, GHSA-wp4p-9pxh-cgx2, GO-2025-3996, MINI-26hr-jvp8-jprw, MINI-84jr-wvg3-5xfx and 8 more.