CVE-2025-59538: argo cd — Exploit & Fix

Description

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-248 CWE-248

CWE-703 CWE-703

Affected Products

Vendor	Product	Versions
argoproj	argo_cd	2.9.0 — 2.14.20
argoproj	argo_cd	3.0.0 — 3.0.19
argoproj	argo_cd	3.1.0 — 3.1.8
argoproj	argo_cd	All

References

Advisories & Patches

https://github.com/argoproj/argo-cd/commit/1a023f1ca7fe4ec942b4b6696804988d5a632baf https://github.com/argoproj/argo-cd/security/advisories/GHSA-gpx4-37g2-c8pv https://github.com/argoproj/argo-cd/security/advisories/GHSA-gpx4-37g2-c8pv

Exploits

https://github.com/argoproj/argo-cd/security/advisories/GHSA-gpx4-37g2-c8pv https://github.com/argoproj/argo-cd/security/advisories/GHSA-gpx4-37g2-c8pv

Frequently Asked Questions

What is CVE-2025-59538? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-59538? +

CVE-2025-59538 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-59538? +

CVE-2025-59538 affects products from argoproj, specifically: argo_cd. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-59538? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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