CVE-2026-49299: Neutron OpenStack Neutron Has An Incorrect Vulnerability

MODERATE
Advisory Identifier: GHSA-xv24-hxh9-2hh9
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CWE-863
Published
Advisory Summary

CVE-2026-49299 is a MODERATE openstack neutron has an incorrect vulnerability (CWE-863: Incorrect Authorization) affecting Neutron libraries in the PyPI ecosystem. The issue involves openstack neutron has an incorrect authorization issue. Remediation is available by upgrading affected packages to version 28.0.1, 27.0.3, 26.0.4.

CVE-2026-49299 at a Glance

CVE Identifier CVE-2026-49299
GHSA Identifier GHSA-xv24-hxh9-2hh9
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-863: Incorrect Authorization
Affected Product Neutron
Package Ecosystem PyPI
Published Date
Last Updated

How to Fix CVE-2026-49299

To remediate this vulnerability, upgrade all affected Neutron dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

neutron fixed: 28.0.1 
pip install neutron>=28.0.1
neutron fixed: 27.0.3 
pip install neutron>=27.0.3
neutron fixed: 26.0.4 
pip install neutron>=26.0.4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show neutron

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-49299, inspect your installed packages using pip:

pip show neutron

Analyze the terminal output to locate any version of Neutron in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 28.0.1), your application is affected.

Note: The pip show neutron command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Neutron, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

In OpenStack Neutron before 28.0.1, the tagging controller enforces plural policy action names on single-tag write operations while the defined policy rules use singular names. The mismatched names evaluate as allowed under the default policy, permitting a project reader to create and update tags on same-project resources. Deployments running Neutron 26.0.0 or later are affected.

CVE-2026-49299 Affected Neutron Versions

3 component(s)
Fixed Versions:
28.0.127.0.326.0.4
Product / Package Ecosystem Affected Versions Fixed Version
neutron
pypi/neutron
PyPI
≥ 28.0.0
< 28.0.1
28.0.1
neutron
pypi/neutron
PyPI
≥ 27.0.0
< 27.0.3
27.0.3
neutron
pypi/neutron
PyPI
≥ 26.0.0
< 26.0.4
26.0.4

References

NVD — CVE-2026-49299 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-49299
bugs.launchpad.net/bugs/2150132 WEB
https://bugs.launchpad.net/bugs/2150132
Neutron Source Repository REPOSITORY
https://github.com/openstack/neutron
review.opendev.org/c/openstack/neutron... WEB
https://review.opendev.org/c/openstack/neutron/+/989099
Neutron Security Information SECURITY
https://www.openwall.com/lists/oss-security/2026/05/28/8
Neutron Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/06/02/7

Frequently Asked Questions

What is CVE-2026-49299?
CVE-2026-49299 is a security vulnerability in Neutron involving OpenStack Neutron has an Incorrect Authorization issue under CWE-863: Incorrect Authorization.
Which Neutron versions are affected?
Affected versions include releases prior to 28.0.1, 27.0.3, 26.0.4 across affected packages: neutron.
What version fixes CVE-2026-49299?
Upgrading to 28.0.1, 27.0.3, 26.0.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is neutron affected?
Yes, neutron is affected in releases prior to 28.0.1, 27.0.3, 26.0.4. Upgrade your dependency to 28.0.1, 27.0.3, 26.0.4 or later.
What CWE is associated with CVE-2026-49299?
CVE-2026-49299 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check PyPI dependencies for CVE-2026-49299?
Run the dependency tree command: 'pip show neutron'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-xv24-hxh9-2hh9",
  "modified" : "2026-07-02T18:50:58Z",
  "published" : "2026-05-29T00:38:33Z",
  "aliases" : [ "CVE-2026-49299" ],
  "summary" : "OpenStack Neutron has an Incorrect Authorization issue",
  "details" : "In OpenStack Neutron before 28.0.1, the tagging controller enforces plural policy action names on single-tag write operations while the defined policy rules use singular names. The mismatched names evaluate as allowed under the default policy, permitting a project reader to create and update tags on same-project resources. Deployments running Neutron 26.0.0 or later are affected.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
  } ],
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    "ranges" : [ {
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      "events" : [ {
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    } ]
  } ],
  "references" : [ {
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  }, {
    "type" : "WEB",
    "url" : "https://www.openwall.com/lists/oss-security/2026/05/28/8"
  }, {
    "type" : "WEB",
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  } ],
  "database_specific" : {
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    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-02T18:50:58Z",
    "nvd_published_at" : "2026-05-28T22:17:02Z"
  }
}