Is CVE-2026-42183 actively exploited?

No active exploitation of CVE-2026-42183 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42183 be exploited remotely?

Yes. CVE-2026-42183 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42183?

CVE-2026-42183 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-42183

CWE-476Published: May 9, 2026· Updated: May 14, 2026

6.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42183 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.