CVE-2026-55707
High
Description
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.
SeverityHigh
CVSS7.1
Exploit probability37. percentile0.4%
ProductNeutron
PublishedAug 5, 2026
First seenAug 5, 2026
Weakness typeCWE-863Incorrect authorization
How to fix
Update
- OpenStack Neutron26.0.6, 27.0.4, 28.0.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| OpenStack Neutron | 14.0.0 ≤ v < 26.0.6, 27.0.0 ≤ v < 27.0.4, 28.0.0 ≤ v < 28.0.2 | 26.0.6, 27.0.4, 28.0.2 |
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