What’s Vulnerable › Vulnerabilities

CVE-2024-40634: Argo CD Unauthenticated Denial of Service (DoS) Vulnerability via /api/webhook Endpoint

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-07-22 · updated 2026-06-17
• Weakness: CWE-400

Description

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. This report details a security vulnerability in Argo CD, where an unauthenticated attacker can send a specially crafted large JSON payload to the /api/webhook endpoint, causing excessive memory allocation that leads to service disruption by triggering an Out Of Memory (OOM) kill. The issue poses a high risk to the availability of Argo CD deployments. This vulnerability is fixed in 2.11.6, 2.10.15, and 2.9.20.

Affected products

• argoproj argo-cd: from 1.0.0 before 2.9.20; from 2.10.0 before 2.10.15; from 2.11.0 before 2.11.6 — fixed in 2.10.15, 2.11.6, 2.9.20

How to fix

Upgrade to a fixed version: argoproj argo-cd 2.10.15, 2.11.6, 2.9.20. Check the vendor advisory for mitigations.

References

• https://github.com/argoproj/argo-cd/commit/46c0c0b64deaab1ece70cb701030b76668ad0cdc
• https://github.com/argoproj/argo-cd/commit/540e3a57b90eb3655db54793332fac86bcc38b36
• https://github.com/argoproj/argo-cd/commit/d881ee78949e23160a0b280bb159e4d3d625a4df
• https://github.com/argoproj/argo-cd/security/advisories/GHSA-jmvp-698c-4x3w
• https://github.com/argoproj/argo-cd/commit/46c0c0b64deaab1ece70cb701030b76668ad0cdc
• https://github.com/argoproj/argo-cd/commit/540e3a57b90eb3655db54793332fac86bcc38b36
• https://github.com/argoproj/argo-cd/commit/d881ee78949e23160a0b280bb159e4d3d625a4df
• https://github.com/argoproj/argo-cd/security/advisories/GHSA-jmvp-698c-4x3w

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