CVE-2026-40886

Argo Workflows: Unchecked annotation parsing in pod informer crashes Argo Workflows controller

State: Published
Severity: 7.7 High
Published: Apr 23, 2026
Updated: Jul 15, 2026
Reserved: Apr 15, 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'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.

Scores

CVSS	Score	Vector	Source
3.1	7.7 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H	GitHub_M
3.1	7.7 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H	redhat-SADP

Weaknesses

CWE-129 Improper Validation of Array Index
CWE-1285 Improper Validation of Specified Index, Position, or Offset in Input

Affected Products

Product	Versions
argo-workflowsargoproj	>= 4.0.0, < 4.0.5Affected >= 3.7.0, < 3.7.14Affected >= 3.6.5, <= 3.6.19Affected

References

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