CVE-2026-44938: Fleet has PSS Bypass through addLabelsFromOptions in Fleet Agent

A vulnerability has been identified in Fleet’s agent-side deployer, which did not filter security-sensitive keys from namespaceLabels in fleet.yaml (or BundleDeployment.spec.options.namespaceLabels) when applying them to the target namespace.

An attacker with git push access to a Fleet-monitored repository could overwrite Pod Security Standards (PSS) enforcement labels on a target namespace. This allows the attacker to weaken admission controls and deploy workloads that PSS policies would otherwise block.

Important: The final impact on confidentiality, integrity, and availability depends on the specific permissions of the leaked credentials.

Fleet team recommends you:

1. Review your system for potentially leaked credentials.
2. Replace any credentials that may be compromised.

Please consult the associated MITRE ATT&CK - Technique - Disable or Modify Tools for further information about this category of attack.