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CVE-2026-42296

Argoproj Argo Workflows broken access control

8.1 HIGHPublic exploitEPSS 0.49%
  1. Published9 May 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

Argoproj Argo Workflows≥ 4.0.0 < 4.0.5 · < 3.7.14

Remediation

Fixed in
Argoproj Argo Workflows≥ 4.0.5

References

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Frequently asked

Is CVE-2026-42296 being actively exploited?

CVE-2026-42296 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.49%.

How severe is CVE-2026-42296?

CVE-2026-42296 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.49% probability of exploitation.

Which products are affected by CVE-2026-42296?

Affected products include Argoproj Argo Workflows.

How do I fix CVE-2026-42296?

Upgrade affected software to a fixed version, for example Argoproj Argo Workflows 4.0.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.