6.5

CVE-2026-42183: argoproj argo_workflows NULL Pointer Dereference

CVSS: 6.5v3.1MediumAnalyzed
AliasesCGA-253v-86wv-g96mCGA-2862-3rwc-wj9hCGA-3vg4-29j8-2hmx
Published 09-05-2026Last modified 13-05-2026
Open JSON

Vulnerability summary

CVE-2026-42183 is a medium (CVSS 6.5) NULL Pointer Dereference vulnerability in argoproj argo_workflows. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.2% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
36/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.57%
0%100%
Low · +0.20 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 1 · Related 2
OPENSUSE-SU-2026:21483-1CGA-CXFQ-6R4Q-6RF3

Timeline

  1. 09-05-2026
    PublishedVulnerability first disclosed.
  2. 13-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

+0.20 pp

From 0.38% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.57%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Argo Workflows

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Chainguard21 products
  • argo-workflow-controller-3.6< 3.6.19-r6
  • argo-workflow-controller-3.7< 3.7.15-r2
  • argo-workflow-controller-fips-3.6< 3.6.19-r10
  • argo-workflow-controller-fips-3.7< 3.7.15-r3
  • argo-workflow-executor-3.6< 3.6.19-r6
Wolfi8 products
  • argo-workflow-controller-3.7< 3.7.15-r2
  • argo-workflow-executor-3.7< 3.7.15-r2
  • argo-workflows-3.7< 3.7.15-r2
  • kubeflow-pipelines-apiserver< 2.16.1-r15 | < 2.17.2-r4
  • kubeflow-pipelines-cache_server< 2.16.1-r15
Github.com/argoproj/argo-workflows3 products
  • v2All versions (No fix recorded)
  • v3All versions (No fix recorded)
  • v4≥ 4.0.0, < 4.0.5
Argoproj2 products
Github.com/argoproj1 product
  • argo-workflowsAll versions (No fix recorded)

5 vendors · 35 products

References

6 links