{"id":"CVE-2026-40886","aliases":["BIT-argo-workflows-2026-40886","GHSA-5jv8-h7qh-rf5p","GO-2026-5148"],"url":"https://o3.security/vulnerability/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.","published":"2026-04-23T18:12:05.782Z","modified":"2026-07-31T18:31:04.846227094Z","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"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/argoproj/argo-workflows/v4","fixedVersion":"4.0.5"},{"ecosystem":"Go","name":"github.com/argoproj/argo-workflows/v3","fixedVersion":"3.7.14"},{"ecosystem":"Go","name":"github.com/argoproj/argo-workflows/v3","fixedVersion":null}],"fix":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-31T18:31:04.846227094Z"}}