CVE-2026-42296

Description

Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. Prior to versions 3.7.14 and 4.0.5, a user with create Workflow permission can bypass templateReferencing: Strict to get host network access, switch service accounts, override pod security context, add tolerations to schedule on control-plane nodes, or enable SA token mounting. This defeats the stated purpose of the feature. The practical impact depends on what Kubernetes-level controls are in place. Clusters with PodSecurity admission or OPA/Gatekeeper would independently block some of these (like hostNetwork). Clusters that rely on Argo's Strict mode as the primary enforcement layer are fully exposed. This issue has been patched in versions 3.7.14 and 4.0.5.

How to fix CVE-2026-42296

To remediate CVE-2026-42296, upgrade the affected package to a fixed version below.

—upgrade to 3.7.14 or later
—upgrade to 3.7.14 or later
—upgrade to 4.0.5 or later

Is CVE-2026-42296 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

from 0, < 3.7.14, >= 4.0.0, < 4.0.5
from 0, < 3.7.14
>= 4.0.0, < 4.0.5

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH8.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N