CVE-2026-43001: Keystone OpenStack Keystone Has An Incorrect Vulnerability

HIGH
Advisory Identifier: GHSA-hhq2-3832-xxcv
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CVSS 7.9
CWE-863
Published
Advisory Summary

CVE-2026-43001 is a HIGH (CVSS 7.9) openstack keystone has an incorrect vulnerability (CWE-863: Incorrect Authorization) affecting Keystone libraries in the PyPI ecosystem. The issue involves openstack keystone has an incorrect authorization issue. Remediation is available in the latest vendor maintenance releases.

CVE-2026-43001 at a Glance

CVE Identifier CVE-2026-43001
GHSA Identifier GHSA-hhq2-3832-xxcv
Severity HIGH
CVSS v3.1 Base Score 7.9
CWE Classification CWE-863: Incorrect Authorization
Affected Product Keystone
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.9

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity High (I:H)
Availability Low (A:L)

How to Fix CVE-2026-43001

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

keystone fixed: Latest secure release 
pip install keystone>=Latest secure release
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 keystone

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-43001, inspect your installed packages using pip:

pip show keystone

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

Note: The pip show keystone 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 Keystone, 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

An issue was discovered in OpenStack Keystone 13 through 29. POST /v3/credentials did not validate that the caller-supplied project_id for an EC2-type credential matched the project of the authenticating application credential. This allowed an attacker holding an unrestricted application credential for project A to create an EC2 credential targeting project B; a subsequent /v3/ec2tokens exchange would then issue a Keystone token scoped to project B while still carrying the original app_cred_id, enabling cross-project lateral movement within the credential owner's role footprint.

CVE-2026-43001 Affected Keystone Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
keystone
pypi/keystone
PyPI
≥ 13.0.0
≤ 29.0.1

References

NVD — CVE-2026-43001 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43001
bugs.launchpad.net/keystone/+bug/21497... WEB
https://bugs.launchpad.net/keystone/+bug/2149775
review.opendev.org/c/openstack/keyston... PACKAGE
https://review.opendev.org/c/openstack/keystone
review.opendev.org/c/openstack/keyston... WEB
https://review.opendev.org/c/openstack/keystone/+/985804
Keystone Security Information SECURITY
https://security.openstack.org/ossa/OSSA-2026-015.html

Frequently Asked Questions

What is CVE-2026-43001?
CVE-2026-43001 is a security vulnerability in Keystone involving OpenStack Keystone has an Incorrect Authorization Issue under CWE-863: Incorrect Authorization.
Which Keystone versions are affected?
Affected versions include releases prior to current release patches across affected packages: keystone.
What version fixes CVE-2026-43001?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is keystone affected?
Yes, keystone is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-43001?
CVE-2026-43001 has a CVSS v3.1 base score of 7.9 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L.
What CWE is associated with CVE-2026-43001?
CVE-2026-43001 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-2026-43001?
Run the dependency tree command: 'pip show keystone'. 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-hhq2-3832-xxcv",
  "modified" : "2026-06-09T10:22:09Z",
  "published" : "2026-05-01T09:30:25Z",
  "aliases" : [ "CVE-2026-43001" ],
  "summary" : "OpenStack Keystone has an Incorrect Authorization Issue",
  "details" : "An issue was discovered in OpenStack Keystone 13 through 29. POST /v3/credentials did not validate that the caller-supplied project_id for an EC2-type credential matched the project of the authenticating application credential. This allowed an attacker holding an unrestricted application credential for project A to create an EC2 credential targeting project B; a subsequent /v3/ec2tokens exchange would then issue a Keystone token scoped to project B while still carrying the original app_cred_id, enabling cross-project lateral movement within the credential owner's role footprint.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "keystone"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "13.0.0"
      }, {
        "last_affected" : "29.0.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-43001"
  }, {
    "type" : "WEB",
    "url" : "https://bugs.launchpad.net/keystone/+bug/2149775"
  }, {
    "type" : "PACKAGE",
    "url" : "https://review.opendev.org/c/openstack/keystone"
  }, {
    "type" : "WEB",
    "url" : "https://review.opendev.org/c/openstack/keystone/+/985804"
  }, {
    "type" : "WEB",
    "url" : "https://security.openstack.org/ossa/OSSA-2026-015.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-07T02:39:59Z",
    "nvd_published_at" : "2026-05-01T09:16:17Z"
  }
}