Vulnerabilities in pkg:pypi/oslo.messaging

PACKAGE

Advisory Identifier: GHSA-76qh-xr7q-h39m

Advisory Summary

CVE-2026-44393 is a HIGH (CVSS 7.4) openstack oslo.messaging does not verify vulnerability (CWE-295: Improper Certificate Validation) affecting Oslo.messaging libraries in the PyPI ecosystem. The issue involves openstack oslo.messaging does not verify rabbitmq broker hostname during tls handshake. Remediation is available in the latest vendor maintenance releases.

1 Known Advisory Record(s)

Package Vulnerability Intelligence

pkg:pypi/oslo.messaging

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:pypi/oslo.messaging. Select an advisory below to view technical details or fixes.

Advisory ID	CVE / NVD	Severity	Summary
GHSA-76qh-xr7q-h39m	CVE-2026-44393	HIGH	OpenStack oslo.messaging does not verify RabbitMQ broker hostname during TLS handshake

CVE-2026-44393 at a Glance

CVE Identifier CVE-2026-44393

GHSA Identifier GHSA-76qh-xr7q-h39m

Severity HIGH

CVSS v3.1 Base Score 7.4

CWE Classification CWE-295: Improper Certificate Validation

Affected Product Oslo.messaging

Package Ecosystem PyPI

Published Date 2026-06-04

Last Updated 2026-07-15

Security Impact

CVSS: 7.4

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

Attack Vector Network (AV:N)

Attack Complexity High (AC:H)

Privileges Required None (PR:N)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality High (C:H)

Integrity High (I:H)

Availability None (A:N)

How to Fix CVE-2026-44393

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

oslo.messaging fixed: Latest secure release

pip install oslo.messaging>=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 oslo.messaging

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-44393, inspect your installed packages using pip:

pip show oslo.messaging

Analyze the terminal output to locate any version of Oslo.messaging 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 oslo.messaging command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-295: Improper Certificate Validation, where the product does not validate, or incorrectly validates, a certificate. In Oslo.messaging, 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 oslo.messaging 1.0.0 through 17.3.0. The oslo.messaging RabbitMQ driver does not perform TLS hostname verification when connecting to the message broker. When ssl_ca_file is configured, the driver enables certificate chain validation but does not pass the expected broker hostname into the underlying TLS stack. Any certificate signed by the deployment CA is accepted regardless of hostname, allowing an attacker who can intercept control-plane traffic to impersonate the RabbitMQ broker and perform a man-in-the-middle attack on RPC and notification traffic. All OpenStack services using oslo.messaging with RabbitMQ over TLS are affected.

CVE-2026-44393 Affected Oslo.messaging Versions

1 component(s)

Product / Package	Ecosystem	Affected Versions	Fixed Version
oslo.messaging pypi/oslo.messaging	PyPI	≥ 1.0.0 ≤ 17.3.0

References

NVD — CVE-2026-44393 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-44393

Oslo.messaging Security Information SECURITY

https://access.redhat.com/security/cve/CVE-2026-44393

bugs.launchpad.net/oslo.messaging/+bug... WEB

https://bugs.launchpad.net/oslo.messaging/+bug/2150316

bugzilla.redhat.com/show_bug.cgi WEB

https://bugzilla.redhat.com/show_bug.cgi?id=2484835

Oslo.messaging Source Repository REPOSITORY

https://github.com/openstack/oslo.messaging

Oslo.messaging Security Information SECURITY

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44393.json

wiki.openstack.org/wiki/ossn/ossn-0096 WEB

https://wiki.openstack.org/wiki/OSSN/OSSN-0096

Frequently Asked Questions

What is CVE-2026-44393?

CVE-2026-44393 is a security vulnerability in Oslo.messaging involving OpenStack oslo.messaging does not verify RabbitMQ broker hostname during TLS handshake under CWE-295: Improper Certificate Validation.

Which Oslo.messaging versions are affected?

Affected versions include releases prior to current release patches across affected packages: oslo.messaging.

What version fixes CVE-2026-44393?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

Is oslo.messaging affected?

Yes, oslo.messaging 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-2026-44393?

CVE-2026-44393 has a CVSS v3.1 base score of 7.4 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

What CWE is associated with CVE-2026-44393?

CVE-2026-44393 is classified under CWE-295: Improper Certificate Validation (The product does not validate, or incorrectly validates, a certificate.).

How can I check PyPI dependencies for CVE-2026-44393?

Run the dependency tree command: 'pip show oslo.messaging'. 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-76qh-xr7q-h39m",
  "modified" : "2026-07-15T22:30:07Z",
  "published" : "2026-06-04T18:30:31Z",
  "aliases" : [ "CVE-2026-44393" ],
  "summary" : "OpenStack oslo.messaging does not verify RabbitMQ broker hostname during TLS handshake",
  "details" : "An issue was discovered in OpenStack oslo.messaging 1.0.0 through 17.3.0. The oslo.messaging RabbitMQ driver does not perform TLS hostname verification when connecting to the message broker. When ssl_ca_file is configured, the driver enables certificate chain validation but does not pass the expected broker hostname into the underlying TLS stack. Any certificate signed by the deployment CA is accepted regardless of hostname, allowing an attacker who can intercept control-plane traffic to impersonate the RabbitMQ broker and perform a man-in-the-middle attack on RPC and notification traffic. All OpenStack services using oslo.messaging with RabbitMQ over TLS are affected.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "oslo.messaging"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0"
      }, {
        "last_affected" : "17.3.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-44393"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2026-44393"
  }, {
    "type" : "WEB",
    "url" : "https://bugs.launchpad.net/oslo.messaging/+bug/2150316"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2484835"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openstack/oslo.messaging"
  }, {
    "type" : "WEB",
    "url" : "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44393.json"
  }, {
    "type" : "WEB",
    "url" : "https://wiki.openstack.org/wiki/OSSN/OSSN-0096"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295", "CWE-297" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-15T22:30:07Z",
    "nvd_published_at" : "2026-06-04T16:16:38Z"
  }
}

CVSS V3

7.4 HIGH