Argo CD is Vulnerable to Unauthenticated Remote DoS via malformed Azure DevOps git.push webhook

Summary

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. For versions 2.9.0-rc1 through 2.14.19, 3.0.0-rc1 through 3.2.0-rc1, 3.1.6 and 3.0.17, when the webhook.azuredevops.username and webhook.azuredevops.password are not set in the default configuration, the /api/webhook endpoint crashes the entire argocd-server process when it receives an Azure DevOps Push event whose JSON array resource.refUpdates is empty. The slice index [0] is accessed without a length check, causing an index-out-of-range panic. A single unauthenticated HTTP POST is enough to kill the process. This issue is resolved in versions 2.14.20, 3.2.0-rc2, 3.1.8 and 3.0.19.

Timeline

1. Oct 1, 2025, 9:09 PM UTCCVE published
2. Oct 2, 2025, 3:32 PM UTCCISA SSVC assessment

   Exploitation: poc · Automatable: yes · Technical impact: partial

3. Oct 2, 2025, 3:54 PM UTCRecord last updated

Affected versions

• argoproj argo-cd

  From 2.9.0-rc1 · fixed in 2.14.20; From 3.2.0-rc1 · fixed in 3.2.0-rc2; From 3.1.0-rc1 · fixed in 3.1.8; From 3.0.0-rc1 · fixed in 3.0.19

• github.com/argoproj/argo-cdGo

  All versions

• github.com/argoproj/argo-cd/v2Go

  From 2.9.0-rc1 · fixed in 2.14.20

• github.com/argoproj/argo-cd/v3Go

  From 3.0.0-rc1 · fixed in 3.0.19; From 3.1.0-rc1 · fixed in 3.1.8; From 3.2.0-rc1 · fixed in 3.2.0-rc2

• github.com/argoproj/argo-cd/v3Go

  From 3.2.0-rc1 · fixed in 3.2.0-rc2

• github.com/argoproj/argo-cd/v3Go

  From 3.1.0-rc1 · fixed in 3.1.8

• github.com/argoproj/argo-cd/v3Go

  From 3.0.0-rc1 · fixed in 3.0.19

References 2