CVE-2026-42183
Argo Workflows: SSO RBAC Delegation Nil Pointer Dereference DoS (gatekeeper.go)
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.
INFO
Published Date :
May 9, 2026, 4:16 a.m.
Last Modified :
May 14, 2026, 6:40 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | LOW | [email protected] |
Solution
- Update Argo Workflows to version 4.0.5 or newer.
- Verify SSO and RBAC configurations are correctly set.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-42183.
| URL | Resource |
|---|---|
| https://github.com/argoproj/argo-workflows/commit/c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4 | Patch |
| https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5 | Release Notes |
| https://github.com/argoproj/argo-workflows/security/advisories/GHSA-p4gq-3vxj-f4jq | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42183 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-42183
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42183 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42183 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 14, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:* versions from (including) 4.0.0 up to (excluding) 4.0.5 Added Reference Type GitHub, Inc.: https://github.com/argoproj/argo-workflows/commit/c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/argoproj/argo-workflows/security/advisories/GHSA-p4gq-3vxj-f4jq Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
May. 09, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-476 Added Reference https://github.com/argoproj/argo-workflows/commit/c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4 Added Reference https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5 Added Reference https://github.com/argoproj/argo-workflows/security/advisories/GHSA-p4gq-3vxj-f4jq