CVE-2026-31892
WorkflowTemplate Security Bypass via podSpecPatch in Strict/Secure Reference Mode
Description
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.
How to fix CVE-2026-31892
To remediate CVE-2026-31892, upgrade the affected package to a fixed version below.
- —upgrade to 3.7.11 or later
- —no fix listed
- —no fix listed
- —no fix listed
- —upgrade to 3.7.11 or later
- —upgrade to 3.7.11 or later
- —upgrade to 4.0.2 or later
- —upgrade to 4.0.2 or later
Is CVE-2026-31892 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (8)
- >= 2.9.0, < 3.7.11, >= 4.0.0, < 4.0.2
- >= 2.9.0
- from 0
- >= 2.9.0
- from 0, < 3.7.11
- from 0, < 3.7.11
- from 0, < 4.0.2
- from 0, < 4.0.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:H |