CVE-2026-40886

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

23/04/2026

Last modified:

28/04/2026

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&#39;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&#39;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.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.70 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

7.70

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:argoproj:argo_workflows::::::go::*	3.6.5 (including)	3.6.19 (including)
cpe:2.3:a:argoproj:argo_workflows::::::go::*	3.7.0 (including)	3.7.14 (excluding)
cpe:2.3:a:argoproj:argo_workflows::::::go::*	4.0.0 (including)	4.0.5 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-40886

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools