neutron: In OpenStack Neutron before 28.0.2, the subnetpool onboarding API does not verify ownership of the target subnets
CVE-2026-55707 is fixed in neutron on 1 platform, first by DEBIAN-CVE-2026-55707, released August 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| neutron · Debian 12.15 (bookworm) | 2:21.0.0-7+deb12u1 | DEBIAN-CVE-2026-55707 | Aug 5, 2026 |
| neutron · Debian 13.5 (trixie) | 2:26.0.3-0+deb13u3 | DEBIAN-CVE-2026-55707 | Aug 5, 2026 |
| neutron · Debian 14 | 2:28.0.1-2 | DEBIAN-CVE-2026-55707 | Aug 5, 2026 |
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