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.

CVSS 4.0

7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 36% of CVEs (scores of 2026-10-25)

CWE

CWE-863

Published

2026-08-05

Modified

2026-10-24

Record from

the NVD, synced 2026-10-24

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

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