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WorkflowTemplate Security Bypass via podSpecPatch in Strict/Secure Reference Mode

Type: advisorySource: OSV1 source record

Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. From 2.9.0 to before 4.0.2 and 3.7.11, A user who can submit Workflows can completely bypass all security settings defined in a WorkflowTemplate by including a podSpecPatch field in their Workflow submission. This works even when the controller is configured with templateReferencing: Strict, which is specifically documented as a mechanism to restrict users to admin-approved templates. The podSpecPatch field on a submitted Workflow takes precedence over the referenced WorkflowTemplate during spec merging and is applied directly to the pod spec at creation time with no security validation. This vulnerability is fixed in 4.0.2 and 3.7.11.

Announced Source revision 1
Original source ↗

BIT-argo-workflows-2026-31892

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:BIT-argo-workflows-2026-31892

argo-workflows

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
3.7.11

Source reference: /affected/0/ranges

4.0.2

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.7.11"
          },
          {
            "introduced": "4.0.0"
          },
          {
            "fixed": "4.0.2"
          }
        ]
      }
    ],
    "package": {
      "name": "argo-workflows",
      "purl": "pkg:bitnami/argo-workflows",
      "ecosystem": "Bitnami"
    },
    "severity": [
      {
        "type": "CVSS_V3",
        "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
      }
    ],
    "database_specific": {
      "source": "https://github.com/bitnami/vulndb/tree/main/data/argo-workflows/BIT-argo-workflows-2026-31892.json"
    }
  }
]
Related CVEs
CVE-2026-31892

Source reference: /aliases

Publisher severity

critical

Source reference: /database_specific/severity

Event
#25937 · Revision 1
Added to Heist Feed
Publisher date
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