# CVE-2026-40886

> Vulnerability · severity: **HIGH** (CVSS 7.7).

## 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.

## Key facts

- **CVE ID:** CVE-2026-40886
- **Published:** 2026-04-23
- **CVSS severity:** HIGH
- **CVSS base score:** 7.7
- **CWE codes:** CWE-129

## Affected products

- `argoproj:argo_workflows`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40886

## Citation

> AI Analytics. CVE-2026-40886. Retrieved 2026-07-23 from https://api.ai-analytics.org/cve/CVE-2026-40886. Derived from NIST NVD. Licensed CC0.

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