{"cve":"CVE-2026-40886","nvd":{"published":"2026-04-23T19:17:28.617","modified":"2026-10-26T22:10:00.163","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","score":7.7},"cwes":["CWE-129","CWE-1285"],"references":["https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p","https://access.redhat.com/security/cve/CVE-2026-40886","https://bugzilla.redhat.com/show_bug.cgi?id=2461236","https://github.com/argoproj/argo-workflows/security/advisories/GHSA-5jv8-h7qh-rf5p","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40886.json"],"products":["argoproj:argo_workflows"],"source":"nvd","synced_at":"2026-10-26T22:26:44.656832877+00:00"},"epss":{"cve":"CVE-2026-40886","score":0.00377,"percentile":0.31469,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-5jv8-h7qh-rf5p","url":"https://osv.dev/vulnerability/GHSA-5jv8-h7qh-rf5p","summary":"Argo Workflows: Unchecked annotation parsing in pod informer crashes Argo Workflows Controller","modified":"2026-09-10T03:50:43.097526471Z","packages":[{"ecosystem":"Go","name":"github.com/argoproj/argo-workflows/v4","purl":"pkg:golang/github.com/argoproj/argo-workflows/v4","ranges":[">=4.0.0 <4.0.5"],"fixed":["4.0.5"]},{"ecosystem":"Go","name":"github.com/argoproj/argo-workflows/v3","purl":"pkg:golang/github.com/argoproj/argo-workflows/v3","ranges":[">=3.7.0 <3.7.14"],"fixed":["3.7.14"]},{"ecosystem":"Go","name":"github.com/argoproj/argo-workflows/v3","purl":"pkg:golang/github.com/argoproj/argo-workflows/v3","ranges":[">=3.6.5 <=3.6.19"],"fixed":[]}]},{"id":"GO-2026-5148","url":"https://osv.dev/vulnerability/GO-2026-5148","summary":"Argo Workflows: Unchecked annotation parsing in pod informer crashes Argo Workflows Controller in github.com/argoproj/argo-workflows","modified":"2026-06-26T15:44:23.606039068Z","packages":[{"ecosystem":"Go","name":"github.com/argoproj/argo-workflows","purl":"pkg:golang/github.com/argoproj/argo-workflows","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/argoproj/argo-workflows/v2","purl":"pkg:golang/github.com/argoproj/argo-workflows/v2","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/argoproj/argo-workflows/v3","purl":"pkg:golang/github.com/argoproj/argo-workflows/v3","ranges":[">=3.6.5"],"fixed":[]},{"ecosystem":"Go","name":"github.com/argoproj/argo-workflows/v3","purl":"pkg:golang/github.com/argoproj/argo-workflows/v3","ranges":[">=3.7.0 <3.7.14"],"fixed":["3.7.14"]},{"ecosystem":"Go","name":"github.com/argoproj/argo-workflows/v4","purl":"pkg:golang/github.com/argoproj/argo-workflows/v4","ranges":[">=4.0.0 <4.0.5"],"fixed":["4.0.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}