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Review reviewHigh

CVE-2026-40886

argoproj argo-workflows, Red Hat OpenShift AI (RHOAI), argo workflows

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 delete...

CVSS
7.7
EPSS
0.38%
30.5% percentile
CISA KEV
Not listed
Published
2026.04.24
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.38%
Technical severityCVSS 7.7

Vulnerability overview

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 delete...

Affected product and versions

Product
argoproj argo-workflows, Red Hat OpenShift AI (RHOAI), argo workflows
Affected versions
>= >= 4.0.0, < 4.0.5, >= >= 3.7.0, < 3.7.14, >= >= 3.6.5, <= 3.6.19, >= 3.6.5 <= 3.6.19, >= 3.7.0 < 3.7.14, >= 4.0.0 < 4.0.5
Fixed versions
3.7.14, 4.0.5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that argoproj argo-workflows, Red Hat OpenShift AI (RHOAI), argo workflows and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CWE
CWE-1285, CWE-129