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Fencer Vulns
low 2.2

CVE-2026-50266 json

OpenStack Neutron: Neutron port RBAC policy bypass allows project managers to set trusted device owners on shared networks

published 2026-06-04 5 mo ago modified 2026-09-10 1 mo ago also GHSA-qmc5-gv6v-8p22 , PYSEC-2026-3491 , EUVD-2026-34301

cvss
2.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

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).

Patch / fix

  • pypi neutron 28.0.1
  • OpenStack Neutron 25.2.4, 26.0.4, 27.0.3, 28.0.1
  • neutron Debian 13 2:26.0.3-0+deb13u2
  • neutron Debian 14 2:28.0.0-7

debian advisories DEBIAN-CVE-2026-50266

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-50266 updated cvss 6.6

openstack-neutron: OpenStack Neutron: Network spoofing via incorrect port RBAC policies

  • Red Hat OpenStack Platform 16.2 python3-neutron, openstack-neutron, openstack-neutron-ml2, openstack-neutron-common, openstack-neutron-rpc-server, openstack-neutron-linuxbridge, +4 more Red Hat OpenStack Platform 17.1 python3-neutron, openstack-neutron, openstack-neutron-ml2, openstack-neutron-common, openstack-neutron-rpc-server, openstack-neutron-bgp-dragent, +7 more Red Hat OpenStack Platform 18.0 openstack-neutron
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.launchpad.net https://bugs.launchpad.net/neutron/+bug/2152115 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 2.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
OSV 3.1 2.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
GitHub 3.1 2.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
pypi neutron
<28.0.1
28.0.1

Affected products

  • OpenStack Neutron

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.