RabbitMQ: OAuth2 silent verify_none fallback for JWKS fetch
CVE-2026-67404 is fixed in rabbitmq-server on 1 platform, first by rabbitmq-server 4.0.5-10ubuntu5.2, released September 25, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, When no CA bundle is available, ssl_options/1 falls back to [{verify, verify_none}] with no warning. An attacker in a man-in-the-middle position can forge the JWKS response, which leads the broker to accept arbitrary JWTs. Preconditions include The OAuth2 plugin must be in use with no cacertfile configured and the OS CA bundle empty or unreadable (for example, in a minimal container), and the attacker must hold a network man-in-the-middle position.. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| rabbitmq-server · Debian 14 | 4.3.0-2 | DEBIAN-CVE-2026-67404 | Sep 25, 2026 |
| rabbitmq-server · Ubuntu 18.04.6 LTS (bionic) | 3.6.10-1ubuntu0.5+esm1 | rabbitmq-server 3.6.10-1ubuntu0.5+esm1 | Oct 19, 2026 |
| rabbitmq-server · Ubuntu 20.04 LTS (focal) | 3.8.3-0ubuntu0.3+esm2 | rabbitmq-server 3.8.3-0ubuntu0.3+esm2 | Oct 19, 2026 |
| rabbitmq-server · Ubuntu 22.04.1 LTS (jammy) | 3.9.27-0ubuntu0.6 | rabbitmq-server 3.9.27-0ubuntu0.6 | Oct 19, 2026 |
| rabbitmq-server · Ubuntu 24.04.5 LTS (noble) | 3.12.1-1ubuntu1.7 | rabbitmq-server 3.12.1-1ubuntu1.7 | Oct 19, 2026 |
| rabbitmq-server · Ubuntu 26.04.1 LTS (resolute) | 4.0.5-10ubuntu5.2 | rabbitmq-server 4.0.5-10ubuntu5.2 | Sep 25, 2026 |
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