Quick answers
- Is CVE-2026-55707 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-55707 being exploited in the wild.
- How severe is CVE-2026-55707?
- Informational severity, with a CVSS score of 6.5, published 5 August 2026.
- Which products and versions are affected?
- OpenStack Neutron >=14.0.0 <26.0.6, >=27.0.0 <27.0.4, >=28.0.0 <28.0.2.
- Is there a fix for CVE-2026-55707?
- A patch was published on 2026-08-05: CVE-2026-55707 assigned Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-55707 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-55707?
- Check whether you run OpenStack Neutron at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an authorization bypass in Neutron's subnetpool onboarding API (PUT /v2.0/subnetpools/{id}/onboard_network_subnets). The API checks only that the target network is visible to the caller, but fails to verify ownership of the subnets before onboarding them into the attacker's subnetpool. An authenticated, non-admin user can exploit this to onboard subnets from another project's RBAC-shared or globally-shared networks, mutating the victim subnet's subnetpool_id and address-scope associations. This allows attackers to alter L3 routing, NAT behavior, and address-scope handling for victim routers, potentially causing denial of service or routing bypasses. Patches are available in Neutron 26.0.6, 27.0.4, and 28.0.2, and affect versions ≥14.0.0 prior to these releases.
Affected products
- OpenStack Neutron >=14.0.0 <26.0.6, >=27.0.0 <27.0.4, >=28.0.0 <28.0.2
Timeline
- 2026-07-29: disclosed: OSSA-2026-032 published
- 2026-08-05: patched: CVE-2026-55707 assigned
- 2026-05-10: other: Vulnerability reported by Tim Shephard