# CVE-2026-44393: 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-44393
- Priority: High
- CVSS: 7.4 (high)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 4, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-oslo.messaging Debian 12.15 (bookworm) | 14.0.3-0+deb12u1 | [DEBIAN-CVE-2026-44393](https://patchblox.com/security/data/fix/linux/debian-cve-2026-44393.md) | Jun 24, 2026 |
| Linux | python-oslo.messaging Debian 13.5 (trixie) | 16.1.0-3+deb13u1 | [DEBIAN-CVE-2026-44393](https://patchblox.com/security/data/fix/linux/debian-cve-2026-44393.md) | Jun 24, 2026 |
| Linux | python-oslo.messaging Debian 14 | 17.3.0-4 | [DEBIAN-CVE-2026-44393](https://patchblox.com/security/data/fix/linux/debian-cve-2026-44393.md) | Jun 24, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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