CVE-2026-50266: Openstack Neutron

Low severity, CVSS 2.2. EPSS: 0.4% chance of exploitation in the next 30 days.

In OpenStack Neutron before 28.0.1, a project manager can create or update a port on a shared network owned by another project and set device_owner to a value that has "network:" at the beginning ("network:dhcp" for example). The default port RBAC policies incorrectly included PROJECT_MANAGER without requiring network ownership, allowing any project manager to obtain trusted network-service port behavior on shared networks. Depending on backend and deployment, this can bypass anti-spoofing and security group protections, enabling DHCP, MAC, or IP spoofing against other tenants on the shared network. This is a regression of CVE-2015-5240 (OSSA-2015-018).

Affected products

• Openstack Neutron: from 25.0.0, before 25.2.4 (fixed in 25.2.4); from 26.0.0, before 26.0.4 (fixed in 26.0.4); from 27.0.0, before 27.0.3 (fixed in 27.0.3); from 28.0.0, before 28.0.1 (fixed in 28.0.1)

Published 2026-06-04. Last modified 2026-07-22.