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CVE-2026-40886

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

Published: Apr 23, 2026Updated: Apr 28, 2026 Sources: CVE List NVDCWE-129
NVD MITRE
7.7CVSSHIGH
EPSS Score
0.3%
Top 79.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-129

Affected Products

argo-workflowsargoproj
Mixed
Cloud & SaaS / container-orchestration
argo workflowsargoproj
Mixed
Cloud & SaaS / container-orchestration
argoprojoss-projectCloud & SaaSaka argo cd, argo-cd, argo workflows, argo workflow

Exploitability

Official Patch Available

References

https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p
github.com

Timeline

Published
Apr 23, 2026
Last Updated
Apr 28, 2026

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