python-oslo.messaging: An issue was discovered in OpenStack oslo.messaging 1.0.0 through 17.3.0
CVE-2026-44393 is fixed in python-oslo.messaging on 1 platform, first by DEBIAN-CVE-2026-44393, released June 24, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-oslo.messaging · Debian 12.15 (bookworm) | 14.0.3-0+deb12u1 | DEBIAN-CVE-2026-44393 | Jun 24, 2026 |
| python-oslo.messaging · Debian 13.5 (trixie) | 16.1.0-3+deb13u1 | DEBIAN-CVE-2026-44393 | Jun 24, 2026 |
| python-oslo.messaging · Debian 14 | 17.3.0-4 | DEBIAN-CVE-2026-44393 | Jun 24, 2026 |
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