Argo Workflows: Unchecked annotation parsing in pod informer crashes Argo Workflows controller_CVE-2026-40886

{
    "lastseen": "",
    "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.",
    "published": "2026-04-23T18:12:05.782Z",
    "modified": "2026-04-23T18:12:05.782Z",
    "type": "cve",
    "title": "Argo Workflows: Unchecked annotation parsing in pod informer crashes Argo Workflows controller",
    "source": "GitHub_M",
    "references": "https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p",
    "id": "CVE-2026-40886",
    "bulletinFamily": "",
    "cwe": [
        "CWE-129"
    ],
    "cvelist": null,
    "sourceData": "argoproj argo-workflows >= 4.0.0, < 4.0.5\nargoproj argo-workflows >= 3.7.0, < 3.7.14\nargoproj argo-workflows >= 3.6.5, <= 3.6.19",
    "sourceHref": "",
    "cvss": {
        "score": 7.7,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
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        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "argo-workflows",
    "version": ">= 4.0.0, < 4.0.5",
    "vendor": "argoproj",
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}