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.

CVSS v3 7.7 HIGH

7.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.1 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p	Exploit Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-40886
https://bugzilla.redhat.com/show_bug.cgi?id=2461236
https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p	Exploit Vendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40886.json

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

No history.

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

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