CVE-2026-40971 Spring Boot's RabbitMQ auto-configuration doesn't perform hostname verification when connecting to the RabbitMQ broker
Attackers can bypass SSL hostname verification in Spring Boot RabbitMQ connections, enabling man-in-the-middle attacks when SSL bundles are configured.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-40971?
CVE-2026-40971 is a medium-severity vulnerability in Spring Boot, published on 27 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-295
Which versions are affected by CVE-2026-40971?
4 open source packages ship an affected version, including org.springframework.boot:spring-boot-rabbitmq. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.springframework.boot:spring-boot-rabbitmq Maven | From 3.5.0 | 3.5.14 |
org.springframework.boot:spring-boot-rabbitmq Maven | From 3.5.0 | 3.5.14 |
org.springframework.boot:spring-boot-rabbitmq Maven | From 4.0.0 | 4.0.6 |
org.springframework.boot:spring-boot-rabbitmq Maven | From 4.0.0 | 4.0.6 |
Products include Vmware Spring Boot.
How do I fix CVE-2026-40971?
Upgrade org.springframework.boot:spring-boot-rabbitmq to a fixed version for your release line: 3.5.14 or 4.0.6.
Is CVE-2026-40971 being exploited?
There is no known exploitation of CVE-2026-40971 in the wild and no public exploit code.
Other vulnerabilities in Spring Boot
- CVE-2023-20873 Spring Boot Security Bypass with Wildcard Pattern Matching on Cloud Foundry
- CVE-2026-40976 Spring Boot's default security filter chain has no authorization rule with Actuator but without Health
- CVE-2026-22731 Authentication Bypass under Actuator Health groups paths
- CVE-2026-22733 Authentication Bypass under Actuator CloudFoundry endpoints
- CVE-2022-27772 Temporary Directory Hijacking to Local Privilege Escalation Vulnerability in org.springframework.boot:spring-boot
Sources
Also known as GHSA-9vc8-qppq-wvxc.