Overview
The cybersecurity landscape is riddled with vulnerabilities that threaten the safety and functionality of systems. One such vulnerability, identified as CVE-2025-59538, affects the Argo CD, a GitOps continuous delivery tool for Kubernetes. This vulnerability is particularly concerning as it can crash the entire argocd-server process, potentially compromising system integrity or leading to data leakage.
Vulnerability Summary
CVE ID: CVE-2025-59538
Severity: High (7.5 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage due to crash of argocd-server process
Affected Products
Product | Affected Versions
Argo CD | 2.9.0-rc1 through 2.14.19, 3.0.0-rc1 through 3.2.0-rc1, 3.1.6 and 3.0.17
How the Exploit Works
The vulnerability arises when the webhook.azuredevops.username and webhook.azuredevops.password are not set in the default Argo CD configuration. In this situation, if the /api/webhook endpoint receives an Azure DevOps Push event with an empty JSON array resource.refUpdates, the argocd-server process crashes. This is because the slice index [0] is accessed without a length check, leading to an out-of-index panic. A single, unauthenticated HTTP POST is sufficient to exploit this vulnerability.
Conceptual Example Code
The vulnerability might be exploited using a HTTP POST request similar to the following:
POST /api/webhook HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "resource": { "refUpdates": [] } }
In this example, the `refUpdates` JSON array is intentionally left empty, exploiting the lack of length check and causing the argocd-server process to crash.
