CVE-2026-55707
OpenStack Neutron Subnetpool Unauthorized Ownership Manipulation
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.
INFO
Published Date :
Aug. 5, 2026, 6:16 a.m.
Last Modified :
Aug. 5, 2026, 6:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | HIGH | 8254265b-2729-46b6-b9e3-3dfca2d5bfca | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Neutron to version 28.0.2 or later.
- Verify subnet ownership before onboarding.
- Restrict subnetpool onboarding access.
- Monitor subnetpool changes.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-55707.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-55707 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-55707
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-55707 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-55707 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
Aug. 05, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://opendev.org/openstack/neutron', 'vendor': 'OpenStack', 'product': 'Neutron', 'versions': [{'status': 'affected', 'version': '14.0.0', 'lessThan': '26.0.6', 'versionType': 'semver'}, {'status': 'affected', 'version': '27.0.0', 'lessThan': '27.0.4', 'versionType': 'semver'}, {'status': 'affected', 'version': '28.0.0', 'lessThan': '28.0.2', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-863 Added Reference https://launchpad.net/bugs/2152113 Added Reference https://security.openstack.org/ossa/OSSA-2026-032.html Added Reference https://www.openwall.com/lists/oss-security/2026/07/29/5 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Aug. 05, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/07/29/5