Spring Boot 4.0.04.0.5: Omitted Hostname Verification in ES SSL Auto-Config
CVE-2026-40970 Published on April 27, 2026
When configured to use an SSL bundle, Spring Boot's Elasticsearch auto-configuration does not perform hostname verification when connecting to the Elasticsearch server. Affected: Spring Boot 4.0.04.0.5; upgrade to 4.0.6 or later per vendor advisory.
Vulnerability Analysis
Weakness Type
Improper Certificate Validation
The software does not validate, or incorrectly validates, a certificate. When a certificate is invalid or malicious, it might allow an attacker to spoof a trusted entity by interfering in the communication path between the host and client. The software might connect to a malicious host while believing it is a trusted host, or the software might be deceived into accepting spoofed data that appears to originate from a trusted host.
Products Associated with CVE-2026-40970
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Affected Versions
Spring Boot:- Version 4.0.0 and below 4.0.6 is affected.