VDB-362375 · CVE-2026-42183 · GHSA-p4gq-3vxj-f4jq

argoproj argo-workflows up to 4.0.4 gatekeeper.go rbacAuthorization null pointer dereference

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.3	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic has been found in argoproj argo-workflows up to 4.0.4. This affects the function rbacAuthorization of the file server/auth/gatekeeper.go. The manipulation leads to null pointer dereference. This vulnerability is referenced as CVE-2026-42183. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in argoproj argo-workflows up to 4.0.4. It has been rated as problematic. This issue affects the function rbacAuthorization of the file server/auth/gatekeeper.go. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-42183 since 04/25/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 4.0.5 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

argoproj

Name

argo-workflows

Version

License

open-source

Website

Product: https://github.com/argoproj/argo-workflows/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: argo-workflows 4.0.5
Patch: c4cc17d0c034fa9a9cc01ef1af6c8016c93071d4

Timelineinfo

04/25/2026 CVE reserved
05/09/2026 +14 days Advisory disclosed
05/09/2026 +0 days VulDB entry created
05/18/2026 +9 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-p4gq-3vxj-f4jq
Status: Confirmed

CVE: CVE-2026-42183 (🔒)
GCVE (CVE): GCVE-0-2026-42183
GCVE (VulDB): GCVE-100-362375

Entryinfo

Created: 05/09/2026 06:54
Updated: 05/18/2026 11:39
Changes: 05/09/2026 06:54 (72), 05/18/2026 11:39 (11)
Complete: 🔍
Cache ID: 216::103