OpenStack oslo.messaging up to 17.3.0 certificate validation

Summaryinfo

A vulnerability identified as problematic has been detected in OpenStack oslo.messaging up to 17.3.0. This impacts an unknown function. This manipulation causes certificate validation. This vulnerability is tracked as CVE-2026-44393. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in OpenStack oslo.messaging up to 17.3.0. It has been declared as problematic. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect integrity. The summary by CVE is:

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.

The advisory is shared at bugs.launchpad.net. This vulnerability is known as CVE-2026-44393 since 05/05/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/05/2026). MITRE ATT&CK project uses the attack technique T1587.003 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 318708 (Linux Distros Unpatched Vulnerability : CVE-2026-44393), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (318708). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Cloud Software

Vendor

• OpenStack

Name

• oslo.messaging

Version

• 17.0
• 17.1
• 17.2
• 17.3.0

License

• free

Website

• Vendor: https://www.openstack.org/

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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