CVE-2026-40971
Spring Boot's RabbitMQ auto-configuration doesn't perform hostname verification when connecting to the RabbitMQ broker
5.0
MEDIUM
CVSS 3.1
EPSS 0.06%
Description
When configured to use an SSL bundle, Spring Boot's RabbitMQ auto-configuration does not perform hostname verification when connecting to the RabbitMQ broker. Affected: Spring Boot 4.0.0–4.0.5 (fix 4.0.6), 3.5.0–3.5.13 (fix 3.5.14) per vendor advisory.
How to fix CVE-2026-40971
To remediate CVE-2026-40971, upgrade the affected package to a fixed version below.
- —upgrade to 4.0.6 or later
Is CVE-2026-40971 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 4.0.0, < 4.0.6
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.0 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L |