CVE catalog
CVE-2026-44393
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_
- Severity
- High · CVSS 7.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.17% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | python-oslo.messaging | sid | 18.3.0-4 | fixed |
| Debian | python-oslo.messaging | forky | 18.3.0-2 | fixed |
| Debian | python-oslo.messaging | trixie | 16.1.0-3+deb13u1 | fixed |
| Debian | python-oslo.messaging | trixie-security | 16.1.0-3+deb13u1 | fixed |
| Debian | python-oslo.messaging | bookworm | 14.0.3-0+deb12u1 | fixed |
| Debian | python-oslo.messaging | bookworm-security | 14.0.3-0+deb12u1 | fixed |
| Opensuse | python-oslo.messaging | tumbleweed | 18.1.0-1.1 | fixed |
| Ubuntu | python-oslo.messaging | 16.04 | 2.5.0-1ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 16.04 | 3.0.0-1ubuntu2 | vulnerable |
| Ubuntu | python-oslo.messaging | 16.04 | 4.5.0-1ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 16.04 | 4.5.1-1ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 16.04 | 4.6.1-2ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 16.04 | 4.6.1-2ubuntu2 | vulnerable |
| Ubuntu | python-oslo.messaging | 18.04 | 5.30.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 18.04 | 5.33.1-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 18.04 | 5.34.1-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 18.04 | 5.35.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 18.04 | 5.35.0-0ubuntu2 | vulnerable |
| Ubuntu | python-oslo.messaging | 18.04 | 5.35.0-0ubuntu3 | vulnerable |
| Ubuntu | python-oslo.messaging | 18.04 | 5.35.0-0ubuntu4 | vulnerable |
| Ubuntu | python-oslo.messaging | 20.04 | 9.7.1-0ubuntu3 | vulnerable |
| Ubuntu | python-oslo.messaging | 20.04 | 10.4.0-0ubuntu2 | vulnerable |
| Ubuntu | python-oslo.messaging | 20.04 | 10.5.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 20.04 | 11.0.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 20.04 | 12.1.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 20.04 | 12.1.6-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 22.04 | 12.9.1-0ubuntu4 | vulnerable |
| Ubuntu | python-oslo.messaging | 22.04 | 12.11.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 22.04 | 12.11.1-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 22.04 | 12.13.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 22.04 | 12.13.0-0ubuntu1.1 | vulnerable |
| Ubuntu | python-oslo.messaging | 22.04 | 12.13.0-0ubuntu1.2 | vulnerable |
| Ubuntu | python-oslo.messaging | 22.04 | 12.13.0-0ubuntu1.3 | vulnerable |
| Ubuntu | python-oslo.messaging | 24.04 | 14.4.1-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 24.04 | 14.6.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 25.10 | 16.1.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 25.10 | 17.1.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 26.10 | 17.3.0-2ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 26.10 | 18.2.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 26.10 | 18.2.0-0ubuntu3 | vulnerable |
| Ubuntu | python-oslo.messaging | 26.10 | 18.3.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 26.04 | 17.1.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 26.04 | 17.2.0-0ubuntu1 | vulnerable |
| Ubuntu | python-oslo.messaging | 26.04 | 17.3.0-2ubuntu1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-oslo.messaging | source | sid | 17.3.0-4 | not yet assigned | Not reported | [1138848] |
| Debian | python-oslo.messaging | source | forky | 17.3.0-4 | not yet assigned | Not reported | [1138848] |
| Debian | python-oslo.messaging | source | trixie | 16.1.0-3+deb13u1 | not yet assigned | Not reported | [1138848] |
| Debian | python-oslo.messaging | source | bookworm | 14.0.3-0+deb12u1 | not yet assigned | Not reported | [1138848] |
| Opensuse | python-oslo.messaging | rpm | tumbleweed | 18.1.0-1.1 | Not reported | OPENSUSE-SU-2026:10973-1 | Not reported |
OpenFactory catalog packages
[openSUSE Tumbleweed]
- [python313-oslo.messaging]Unknown
Source package: [python-oslo.messaging]
Details (1)
18.2.0-1.1· noarch · tumbleweedUnknown · Fixed:
18.1.0-1.1Version impact unknown
nvd · python-oslo.messaging · opensuse · tumbleweed
- [python314-oslo.messaging]Unknown
Source package: [python-oslo.messaging]
Details (1)
18.2.0-1.1· noarch · tumbleweedUnknown · Fixed:
18.1.0-1.1Version impact unknown
nvd · python-oslo.messaging · opensuse · tumbleweed
- [python3-oslo.messaging-doc]Unknown
Source package: [python-oslo.messaging]
Details (1)
18.2.0-1.1· noarch · tumbleweedUnknown · Fixed:
18.1.0-1.1Version impact unknown
nvd · python-oslo.messaging · opensuse · tumbleweed
[Debian 12 (Bookworm)]
- [python3-oslo.messaging]Fixed
Source package: [python-oslo.messaging]
Details (4)
14.0.3-0+deb12u1· all · bookwormFixed · Fixed:
14.0.3-0+deb12u1nvd · python-oslo.messaging · debian · bookworm; nvd · python-oslo.messaging · debian · 12
14.0.3-0+deb12u1· all · bookwormFixed · Fixed:
14.0.3-0+deb12u1nvd · python-oslo.messaging · debian · bookworm; nvd · python-oslo.messaging · debian · 12
14.0.3-0+deb12u1· all · bookworm-securityFixed · Fixed:
14.0.3-0+deb12u1nvd · python-oslo.messaging · debian · bookworm; nvd · python-oslo.messaging · debian · 12
14.0.3-0+deb12u1· all · bookworm-securityFixed · Fixed:
14.0.3-0+deb12u1nvd · python-oslo.messaging · debian · bookworm; nvd · python-oslo.messaging · debian · 12
[Debian 13 (Trixie)]
- [python3-oslo.messaging]Fixed
Source package: [python-oslo.messaging]
Details (4)
16.1.0-3+deb13u1· all · trixieFixed · Fixed:
16.1.0-3+deb13u1nvd · python-oslo.messaging · debian · 13
16.1.0-3+deb13u1· all · trixieFixed · Fixed:
16.1.0-3+deb13u1nvd · python-oslo.messaging · debian · 13
16.1.0-3+deb13u1· all · trixie-securityFixed · Fixed:
16.1.0-3+deb13u1nvd · python-oslo.messaging · debian · 13
16.1.0-3+deb13u1· all · trixie-securityFixed · Fixed:
16.1.0-3+deb13u1nvd · python-oslo.messaging · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10973-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-44393]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-44393]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-44393]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10973-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-44393]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44393.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]