Improper validation of certificate with host mismatch in Spring Boot - CVE-2026-40971
Published: April 27, 2026
Vulnerability identifier: #VU128230
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-40971
CWE-ID: CWE-297
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Spring
Affected software:
Spring Boot
Spring Boot
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information, modify data, or cause a denial of service.
The vulnerability exists due to improper certificate validation in RabbitMQ auto-configuration when connecting to the RabbitMQ broker using an SSL bundle. A remote attacker can present a crafted certificate to disclose sensitive information, modify data, or cause a denial of service.
How to mitigate CVE-2026-40971
Install security update from vendor's website.