VULNERABILITY INTELLIGENCE

CVE-2026-40886

CVSS score7.7 HIGH
EPSS probability0.38%
CISA KEVNot currently listed
Published2026-04-23
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Description

Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. From 3.6.5 to 4.0.4, an unchecked array index in the pod informer's podGCFromPod() function causes a controller-wide panic when a workflow pod carries a malformed workflows.argoproj.io/pod-gc-strategy annotation. Because the panic occurs inside an informer goroutine (outside the controller's recover() scope), it crashes the entire controller process. The poisoned pod persists across restarts, causing a crash loop that halts all workflow processing until the pod is manually deleted. This vulnerability is fixed in 4.0.5 and 3.7.14.

Weakness classification

  • security-advisories@github.com: CWE-129
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-1285

Primary references