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CVE-2025-59531: Argo CD Denial of Service Vulnerability due to Malformed API Requests

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Overview

This report presents a detailed analysis of CVE-2025-59531, a significant vulnerability found in certain versions of Argo CD, a GitOps continuous delivery tool for Kubernetes. The vulnerability allows for the potential compromise of systems or leakage of data, making it a serious concern for businesses relying on the affected versions of the software.

Vulnerability Summary

CVE ID: CVE-2025-59531
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage, Denial of Service (DoS)

Affected Products

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Product | Affected Versions

Argo CD | 1.2.0 to 1.8.7, 2.0.0-rc1 to 2.14.19, 3.0.0-rc1 to 3.2.0-rc1, 3.1.7, and 3.0.18

How the Exploit Works

This vulnerability is triggered when the Argo CD’s /api/webhook endpoint receives a malformed Bitbucket Server payload (non-array repository.links.clone field). In the absence of a configured webhook.bitbucketserver.secret, this can cause the API server to crash, leading to a denial of service. A single unauthenticated request is enough to trigger a CrashLoopBackOff, and if all replicas are targeted, it can result in a complete API outage.

Conceptual Example Code

Below is a conceptual example of a malicious HTTP request exploiting the vulnerability:

POST /api/webhook HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"repository": {
"links": {
"clone": "malformed_data"
}
}
}

Recommendations for Mitigation

Affected users are advised to apply the vendor’s patch, updating to versions 2.14.20, 3.2.0-rc2, 3.1.8 or 3.0.19. In the interim, a web application firewall (WAF) or an intrusion detection system (IDS) can be used to mitigate the risk of exploit.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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