Resource exhaustion in Argo Workflows - CVE-2026-42294
Published: April 23, 2026
Vulnerability identifier: #VU126911
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42294
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled memory consumption in the webhook interceptor when handling requests to the /api/v1/events/ endpoint with an extremely large body before authentication or signature verification. A remote attacker can send a specially crafted request with an extremely large body to cause a denial of service.
The issue can cause the Argo Server to allocate excessive memory and potentially crash with an out-of-memory condition.
Affected software
Argo Workflows
How to mitigate CVE-2026-42294
Install security update from vendor's website.
Argo Workflows - addressed in versions 3.7.14, 4.0.5