5.0
Medium
CVE-2026-40992 Spring Boot's Mail auto-configuration does not enable hostname verification
Description
Spring Boot's Mail auto-configuration does not enable hostname verification. Applications that set the relevant JavaMail property, such as spring.mail.properties.mail.smtp.ssl.checkserveridentity=true, are not affected. Affected versions: Spring Boot 4.0.0 through 4.0.6; 3.5.0 through 3.5.14; 3.4.0 through 3.4.16.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Spring Boot 4.0 | 4.0.0 → < 4.0.6.1 | 4.0.6.1 |
| Spring Boot 3.5 | 3.5.0 → < 3.5.14.1 | 3.5.14.1 |
| Spring Boot 3.4 | 3.4.0 → < 3.4.17 | 3.4.17 |
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