CVE-2026-50564 CRITICAL

CVE-2026-50564: Fission Environment CRD podspec passthrough enables hostPID/hostNetwork/privileged pods, node escape

Vendor Fission
Product fission
Weakness CWE-269
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, Fission's Environment CRD exposes spec.runtime.podSpec and spec.builder.podSpec, which are merged into the Kubernetes pod specs for runtime and builder pods. The merge logic propagated hostNetwork, hostPID, hostIPC, container privileged, and serviceAccountName from the user-supplied podspec with no filtering, and Environment.Validate performed no security-relevant checks on these fields. This issue has been patched in version 1.24.0.

Key dates

02Disclosure timeline

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