Vulnerability in Argoproj Argo-Workflows
CVE-2026-54526
Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. Prior to 3.7.15 and 4.0.6, the allow-list fix for CVE-2026-31892 is incomplete because workflow/util/merge.go ValidateUserOverrides and SanitizeUserWorkflowSpec walk only the top-level fields of WorkflowSpec via reflection, and WorkflowSpec.ArtifactGC is allow-listed wholesale; the struct behind that field, WorkflowLevelArtifactGC, has a PodSpecPatch sub-field whose contents flow unmodified into util.ApplyPodSpecPatch on the artifact-GC pod, the same sink the original fix closed for WorkflowSpec.PodSpecPatch, so a user submitting a Workflow under templateReferencing: Strict or Secure (against a referenced WorkflowTemplate that declares an output artifact and setting spec.artifactGC.strategy: OnWorkflowCompletion) can still inject an arbitrary strategic merge patch into the artifact-GC pod, including hostPath volumes, privileged: true, arbitrary image and command, and hostNetwork: true, defeating the stated purpose of Strict/Secure reference mode. This issue is fixed in versions 3.7.15 and 4.0.6.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Argoproj Argo-Workflows — versions < 3.7.15, >= 4.0.0, < 4.0.6
- Argoproj Argo Workflows
Weakness classification (CWE)
References
- github.com/argoproj/argo-workflows/commit/277e9cef0ad16d7eaaab253573d0695951a65… (Patch)
- github.com/argoproj/argo-workflows/commit/358cc3968c8f06f1be0967e41df191088db0b… (Patch)
- github.com/argoproj/argo-workflows/releases/tag/v3.7.15 (Product, Release Notes)
- github.com/argoproj/argo-workflows/releases/tag/v4.0.6 (Product, Release Notes)
- github.com/argoproj/argo-workflows/security/advisories/GHSA-48p8-g2fx-3wwm (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-54526?
- CVE-2026-54526 is a critical-severity vulnerability in Argoproj Argo-Workflows, classified under Improper Access Control. CVSS score: 9.9/10. Published 2026-07-16.
- How severe is CVE-2026-54526?
- Critical severity. CVSS v3 base score is 9.9 out of 10.