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Vulnerability · Published Aug 5, 2026 · Assigned by mitre

CVE-2026-55707

High 7.1

In plain English

A high-severity incorrect authorization in Neutron from OpenStack. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.1High
Exploit odds (30 days)0.4%top 62.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12neutron2:21.0.0-7+deb12u1DEBIAN-CVE-2026-55707
Debian:13neutron2:26.0.3-0+deb13u3DEBIAN-CVE-2026-55707
Debian:14neutron2:28.0.1-2DEBIAN-CVE-2026-55707
Ubuntu:22.04:LTSneutronno fix listedUBUNTU-CVE-2026-55707
Ubuntu:24.04:LTSneutronno fix listedUBUNTU-CVE-2026-55707
Ubuntu:26.04:LTSneutronno fix listedUBUNTU-CVE-2026-55707
Ubuntu:26.10neutronno fix listedUBUNTU-CVE-2026-55707

Affected products (as reported)

VendorProductVersions
OpenStack Neutron 14.0.0 – before 26.0.627.0.0 – before 27.0.428.0.0 – before 28.0.2

Weakness: CWE-863 · Vector: 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

References