CVE-2026-55707

In OpenStack Neutron before 28.0.2, the subnetpool onboarding API does not verify ownership of the target subnets. An authenticated user can onboard subnets from another project's shared network into their own subnetpool, mutating the victim's subnet state and altering L3 routing and address scope behavior for victim routers.

Score

CVSS 4.0 7.1 High

Status

Deferred - cve@mitre.org

Published

2026-08-05

Last modified

2026-10-24

Weaknesses

CWE-863

Affected products

• Neutron (Openstack)

References

• https://launchpad.net/bugs/2152113
• https://security.openstack.org/ossa/OSSA-2026-032.html
• https://www.openwall.com/lists/oss-security/2026/07/29/5
• http://www.openwall.com/lists/oss-security/2026/07/29/5
• https://lists.debian.org/debian-lts-announce/2026/08/msg00024.html