CVE-2026-33551: OpenStack Keystone Restricted Application Credentials Can Create Vulnerability

LOW
Advisory Identifier: GHSA-4phw-6824-6cfp
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CVSS 3.5
CWE-863
Published
Advisory Summary

CVE-2026-33551 is a LOW (CVSS 3.5) restricted application credentials can create vulnerability (CWE-863: Incorrect Authorization) affecting OpenStack Keystone libraries in the PyPI ecosystem. The issue involves restricted application credentials can create ec2 credentials. Remediation is available by upgrading affected packages to version 26.1.1.

CVE-2026-33551 at a Glance

CVE Identifier CVE-2026-33551
GHSA Identifier GHSA-4phw-6824-6cfp
Severity LOW
CVSS v3.1 Base Score 3.5
CWE Classification CWE-863: Incorrect Authorization
Affected Product OpenStack Keystone
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 3.5

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

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

How to Fix CVE-2026-33551

To remediate this vulnerability, upgrade all affected OpenStack 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: 26.1.1 
pip install keystone>=26.1.1
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-2026-33551, inspect your installed packages using pip:

pip show keystone

Analyze the terminal output to locate any version of OpenStack Keystone in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 26.1.1), 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 OpenStack 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 14 through 26 before 26.1.1, 27.0.0, 28.0.0, and 29.0.0. Restricted application credentials can create EC2 credentials. By using a restricted application credential to call the EC2 credential creation API, an authenticated user with only a reader role may obtain an EC2/S3 credential that carries the full set of the parent user's S3 permissions, effectively bypassing the role restrictions imposed on the application credential. Only deployments that use restricted application credentials in combination with the EC2/S3 compatibility API (swift3 / s3api) are affected.

CVE-2026-33551 Affected OpenStack Keystone Versions

1 component(s)
Fixed Versions:
26.1.1
Product / Package Ecosystem Affected Versions Fixed Version
keystone
pypi/keystone
PyPI
≥ 14.0.0
< 26.1.1
26.1.1

References

NVD — CVE-2026-33551 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33551
bugs.launchpad.net/keystone/+bug/21421... WEB
https://bugs.launchpad.net/keystone/+bug/2142138
OpenStack Keystone Source Repository REPOSITORY
https://github.com/openstack/keystone
OpenStack Keystone Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/keystone/PYSEC-2026-202.yaml
OpenStack Keystone Security Information SECURITY
https://security.openstack.org/ossa/OSSA-2026-005.html
OpenStack Keystone Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/04/07/12

Frequently Asked Questions

What is CVE-2026-33551?
CVE-2026-33551 is a security vulnerability in OpenStack Keystone involving Restricted application credentials can create EC2 credentials under CWE-863: Incorrect Authorization.
Which OpenStack Keystone versions are affected?
Affected versions include releases prior to 26.1.1 across affected packages: keystone.
What version fixes CVE-2026-33551?
Upgrading to 26.1.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is keystone affected?
Yes, keystone is affected in releases prior to 26.1.1. Upgrade your dependency to 26.1.1 or later.
What is the CVSS score of CVE-2026-33551?
CVE-2026-33551 has a CVSS v3.1 base score of 3.5 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N.
What CWE is associated with CVE-2026-33551?
CVE-2026-33551 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-2026-33551?
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-4phw-6824-6cfp",
  "modified" : "2026-06-09T11:55:45Z",
  "published" : "2026-04-10T03:31:10Z",
  "aliases" : [ "CVE-2026-33551" ],
  "summary" : "OpenStack Keystone: Restricted application credentials can create EC2 credentials",
  "details" : "An issue was discovered in OpenStack Keystone 14 through 26 before 26.1.1, 27.0.0, 28.0.0, and 29.0.0. Restricted application credentials can create EC2 credentials. By using a restricted application credential to call the EC2 credential creation API, an authenticated user with only a reader role may obtain an EC2/S3 credential that carries the full set of the parent user's S3 permissions, effectively bypassing the role restrictions imposed on the application credential. Only deployments that use restricted application credentials in combination with the EC2/S3 compatibility API (swift3 / s3api) are affected.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "keystone"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "14.0.0"
      }, {
        "fixed" : "26.1.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33551"
  }, {
    "type" : "WEB",
    "url" : "https://bugs.launchpad.net/keystone/+bug/2142138"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openstack/keystone"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/keystone/PYSEC-2026-202.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://security.openstack.org/ossa/OSSA-2026-005.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/04/07/12"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-10T22:09:31Z",
    "nvd_published_at" : "2026-04-10T03:16:02Z"
  }
}