PT-2026-48515 · Fission · Fission

Published 2026-06-10 · Updated 2026-06-10 · CVE-2026-50570

NVD

CVSS v3.1

8.5

High

Base vector

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

Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.25.0, Fission added PodSpec safety validation for tenant-facing Environment and Function CRDs (ValidatePodSpecSafety / ValidateContainerSafety admission webhook + sanitizeContainerSecurityContext executor merge layer), but the capability check was implemented as a fixed denylist of six Linux capabilities (SYS ADMIN, NET ADMIN, SYS PTRACE, SYS MODULE, DAC READ SEARCH, DAC OVERRIDE). The denylist omitted CAP SYS TIME, among others. As a result, a tenant who could create a Function or Environment CRD could request securityContext.capabilities.add: ["SYS TIME"], pass Fission's admission validation and merge-layer sanitization, and run attacker-controlled code with CAP SYS TIME in the resulting function or runtime container. This issue has been patched in version 1.25.0.

Fix

Improper Privilege Management

Incorrect Permission

Weakness Enumeration

CWE-269

CWE-732

Related Identifiers

CVE-2026-50570

Affected Products

Fission

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-50570 · Security Note
• https://github.com/fission/fission/security/advisories/GHSA-qf5v-m7p4-95rp · Note
• https://github.com/fission/fission/releases/tag/v1.25.0 · Note
• https://github.com/fission/fission/pull/3465 · Note