{"id":"CVE-2026-40886","summary":"Argo Workflows: Unchecked annotation parsing in pod informer crashes Argo Workflows controller","details":"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.","aliases":["BIT-argo-workflows-2026-40886","GHSA-5jv8-h7qh-rf5p","GO-2026-5148"],"modified":"2026-07-16T03:31:02.521013773Z","published":"2026-04-23T18:12:05.782Z","related":["CGA-m56j-h8gv-cgw8"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40886.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-129"]},"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40886.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-40886"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40886.json"},{"type":"ADVISORY","url":"https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40886"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2461236"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/argoproj/argo-workflows","events":[{"introduced":"9e532061c064d1205610b1932a0fb3c4dc053421"},{"last_affected":"c66a734c911a25a1e0f626af5995a222d6267e37"},{"introduced":"d1d689b367c4c8a5a8a095ae60b5d7043f99eda9"},{"fixed":"ca37b537cd34d18029146a755bf42a9b2364c49b"},{"introduced":"a8bff4a72130bc1a13d95c6f73ff3fafec880287"},{"fixed":"0ab1452144d8f4d57c50b37ce50dad218868e950"}],"database_specific":{"source":"CPE_RANGE","cpe":"cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*","extracted_events":[{"introduced":"3.6.5"},{"last_affected":"3.6.19"},{"introduced":"3.7.0"},{"fixed":"3.7.14"},{"introduced":"4.0.0"},{"fixed":"4.0.5"}]}}],"versions":["v3.7.13","v4.0.4","v3.7.12","v4.0.3","v4.0.2","v3.7.11","v3.7.10","v4.0.1","v3.6.19","v3.6.18","v4.0.0","v3.7.9","v3.6.17","v3.7.8","v3.7.7","v3.6.16","v3.6.15","v3.7.6","v3.7.5","v3.6.14","v3.6.13","v3.7.4","v3.7.3","v3.6.12","v3.6.11","v3.7.2","v3.7.1","v3.7.0-rc4","v3.7.0","v3.6.10","v3.6.9","v3.6.8","v3.6.7","v3.6.6","v3.6.5"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40886.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H"}]}