CVE-2026-44393

HIGH EPSS 3.2%

Published Jun 4, 20263w ago · Modified Jun 17, 20262w ago

7.4 CVSS 3.1

High

Published Jun 4, 2026 3w ago

Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score

7.4

Exploitability

2.2

Impact

5.2

Vector string

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector Network

Attack Complexity High

Privileges Required None

User Interaction None

Scope Unchanged

Confidentiality High

Integrity High

Availability None

Threat Intelligence

EPSS Exploit Probability

3.2% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-297

References 2

bugs.launchpad.net https://bugs.launchpad.net/oslo.messaging/+bug/2150316
wiki.openstack.org https://wiki.openstack.org/wiki/OSSN/OSSN-0096

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.