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

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Summary

CVECVE-2026-40886
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-23 19:17:28 UTC
Updated2026-04-23 19:17:28 UTC
DescriptionArgo 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.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Problem Types: CWE-129 | CWE-129 CWE-129: Improper Validation of Array Index

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
3.1CNADECLARED7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Argoproj Argo-workflows affected >= 4.0.0, < 4.0.5 Not specified
CNA Argoproj Argo-workflows affected >= 3.7.0, < 3.7.14 Not specified
CNA Argoproj Argo-workflows affected >= 3.6.5, <= 3.6.19 Not specified

References

ReferenceSourceLinkTags
github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p [email protected] github.com
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