CVE-2026-42183 | THREATINT

Description

Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. From version 4.0.0 to before version 4.0.5, a nil pointer dereference in server/auth/gatekeeper.go rbacAuthorization() causes a panic (denial of service) for SSO users whose claims match a namespace-level RBAC rule but not an SSO-namespace rule, when SSO_DELEGATE_RBAC_TO_NAMESPACE=true. This issue has been patched in version 4.0.5.

PUBLISHED Reserved 2026-04-25 | Published 2026-05-09 | Updated 2026-05-09 | Assigner GitHub_M

LOW: 2.3CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Problem types

CWE-476: NULL Pointer Dereference

Product status

>= 4.0.0, < 4.0.5

affected

References

github.com/...kflows/security/advisories/GHSA-p4gq-3vxj-f4jq

github.com/...ommit/c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4

github.com/argoproj/argo-workflows/releases/tag/v4.0.5

cve.org (CVE-2026-42183)

nvd.nist.gov (CVE-2026-42183)

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