CVE-2026-40971

FAUCET Score

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.

First published: Apr 27, 2026Last modified: Apr 28, 2026

Impacted Technologies

Vendor	Product	Version(s)	CPE
		>= 3.5.0, < 3.5.14CPE matchmatch criteria	cpe:2.3:a:vmware:spring_boot::::::::
		>= 4.0.0, < 4.0.6CPE matchmatch criteria	cpe:2.3:a:vmware:spring_boot::::::::

CVSS Data

CVSS version used by this source: 3.1

5.0MEDIUM

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector

ADJACENT_NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

LOW

Exploitability Score

1.6

Impact Score

3.4

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.16%

Probability of exploitation in next 30 days

EPSS Percentile

5.3%

Percentile rank of EPSS score among Peer Group

As of 2026-07-26

Model: v2026.06.15

This CVE's current EPSS score of 0.0016 is in the 0th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

mavenpatch availablevia ghsa

Product: org.springframework.boot:spring-boot-rabbitmqFixed in: 4.0.6

mavenpatch availablevia ghsa

Product: org.springframework.boot:spring-boot-rabbitmqFixed in: 3.5.14

Vendor Advisories (1)

mavenGHSA-9vc8-qppq-wvxcmedium

Spring Boot's RabbitMQ auto-configuration doesn't perform hostname verification when connecting to the RabbitMQ broker

Apr 28, 2026

References

spring.io / security/cve-2026-40971

Vendor Advisory