Vulnerability · Published Jun 4, 2026 · Assigned by mitre
CVE-2026-50266
Low 2.2
In plain English
A low-severity incorrect authorization in Neutron from OpenStack. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | neutron | 2:26.0.3-0+deb13u2 | DEBIAN-CVE-2026-50266 |
| Debian:14 | neutron | 2:28.0.0-7 | DEBIAN-CVE-2026-50266 |
| PyPI | neutron | 28.0.1 | GHSA-qmc5-gv6v-8p22 |
| PyPI | neutron | 28.0.1 | PYSEC-2026-3491 |
| Ubuntu:22.04:LTS | neutron | no fix listed | UBUNTU-CVE-2026-50266 |
| Ubuntu:24.04:LTS | neutron | no fix listed | UBUNTU-CVE-2026-50266 |
| Ubuntu:25.10 | neutron | no fix listed | UBUNTU-CVE-2026-50266 |
| Ubuntu:26.04:LTS | neutron | no fix listed | UBUNTU-CVE-2026-50266 |
| Ubuntu:26.10 | neutron | no fix listed | UBUNTU-CVE-2026-50266 |
Affected products (as reported)
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N