CVE-2026-50566 CRITICAL

CVE-2026-50566: Fission: Environment Runtime.Container and Builder.Container SecurityContext bypass allows privileged pod creation

Vendor Fission
Product fission
Weakness CWE-250
Published June 10, 2026
Last update June 12, 2026

CVSS base score

9.9/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.24.0, a tenant with environments.fission.io create/update RBAC can run privileged / allowPrivilegeEscalation / dangerous-capability containers in the Fission function or builder namespace, scheduled under the executor's high-privilege service account — enabling container-sandbox escape, host filesystem and network access, and potential node- and cluster-level compromise. This issue has been patched in version 1.24.0.

Key dates

02Disclosure timeline

June 10, 2026 CVE published
June 12, 2026 Record updated