High
python-oslo.messaging — security advisory
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.
- Products
- python-oslo.messaging
- Affected versions
- 10.4.0-0ubuntu2, 10.5.0-0ubuntu1, 11.0.0-0ubuntu1, 12.1.0-0ubuntu1, 12.1.6-0ubuntu1, 12.11.0-0ubuntu1, 12.11.1-0ubuntu1, 12.13.0-0ubuntu1, 12.13.0-0ubuntu1.1, 12.13.0-0ubuntu1.2, 12.13.0-0ubuntu1.3, 12.9.1-0ubuntu4, 14.4.1-0ubuntu1, 14.6.0-0ubuntu1, 16.1.0-0ubuntu1, 17.1.0-0ubuntu1, 17.2.0-0ubuntu1, 17.3.0-2ubuntu1, 18.2.0-0ubuntu1, 18.2.0-0ubuntu3, 18.3.0-0ubuntu1, 2.5.0-1ubuntu1, 3.0.0-1ubuntu2, 4.5.0-1ubuntu1, 4.5.1-1ubuntu1, 4.6.1-2ubuntu1, 4.6.1-2ubuntu2, 5.30.0-0ubuntu1, 5.33.1-0ubuntu1, 5.34.1-0ubuntu1, 5.35.0-0ubuntu1, 5.35.0-0ubuntu2, 5.35.0-0ubuntu3, 5.35.0-0ubuntu4, 9.7.1-0ubuntu3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-44393
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 13:48 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-44393
python-oslo.messaging
Fixed versions: Not specified
python-oslo.messaging
Fixed versions: Not specified
python-oslo.messaging
Fixed versions: Not specified
python-oslo.messaging
Fixed versions: Not specified
python-oslo.messaging
Fixed versions: Not specified
python-oslo.messaging
Fixed versions: Not specified
python-oslo.messaging
Fixed versions: Not specified
python-oslo.messaging
Fixed versions: Not specified
Complete source record
{
"id": "fad60ebda5d76d185d4cf400819861d0e264c1e475921e9b4ea54246671d1ed4",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-44393",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-44393",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-44393",
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"severity": "high",
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"modified": "2026-10-21T10:16:13.903960103Z",
"provider": "osv",
"upstream": [
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"references": [
"https://ubuntu.com/security/CVE-2026-44393",
"https://www.cve.org/CVERecord?id=CVE-2026-44393",
"https://wiki.openstack.org/wiki/OSSN/OSSN-0096",
"https://launchpad.net/bugs/2150316"
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"source_id": "core-osv",
"document_id": 392100,
"published_at": "2026-06-04T16:16:00+00:00"
}