High 7.1Published Aug 5, 2026

CVE-2026-55707In OpenStack Neutron before 28.0.2, the subnetpool onboarding API does not verify ownership of the target subnets.

Updated under an hour ago (2026-10-19 09:00 UTC)

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It affects OpenStack Neutron. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.1 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
Weakness (CWE): CWE-863
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mitre
NVD analysis: Deferred
Record last updated: Aug 12, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

OpenStack Neutron openstack:neutron (from the name)	from 14.0.0 before 26.0.6; from 27.0.0 before 27.0.4; from 28.0.0 before 28.0.2	CNA record

References

https://launchpad.net/bugs/2152113issue-tracking
https://security.openstack.org/ossa/OSSA-2026-032.htmlvendor-advisory
https://www.openwall.com/lists/oss-security/2026/07/29/5vendor-advisory, mailing-list
http://www.openwall.com/lists/oss-security/2026/07/29/5
https://lists.debian.org/debian-lts-announce/2026/08/msg00024.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.