CVE-2026-40886

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.
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*
cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*
cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*

History

30 Jun 2026, 03:19

Type Values Removed Values Added
CWE CWE-1285
References
  • () https://access.redhat.com/security/cve/CVE-2026-40886 -
  • () https://bugzilla.redhat.com/show_bug.cgi?id=2461236 -
  • () https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40886.json -

28 Apr 2026, 14:09

Type Values Removed Values Added
First Time Argoproj argo Workflows
Argoproj
References () https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p - () https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p - Exploit, Vendor Advisory
CPE cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*

25 Apr 2026, 02:16

Type Values Removed Values Added
References () https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p - () https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p -

23 Apr 2026, 19:17

Type Values Removed Values Added
New CVE

Information

Published : 2026-04-23 19:17

Updated : 2026-07-15 02:21


NVD link : CVE-2026-40886

Mitre link : CVE-2026-40886

CVE.ORG link : CVE-2026-40886


JSON object : View

Products Affected

argoproj

  • argo_workflows
CWE
CWE-129

Improper Validation of Array Index

CWE-1285

Improper Validation of Specified Index, Position, or Offset in Input