Spring Security Advisories

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Mail Auto-Configuration Does Not Enable SSL Hostname Verification

MEDIUM | JUNE 10, 2026 | CVE-2026-40992

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 Spring Products and Versions

Spring Boot:

  • 4.0.0 - 4.0.6
  • 3.5.0 - 3.5.14
  • 3.4.0 - 3.4.16

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.
Fix versionAvailability
4.0.7OSS
4.0.6.1Enterprise Support Only
3.5.15OSS
3.5.14.1Enterprise Support Only
3.4.17Enterprise Support Only

No further mitigation steps are necessary.

Credit

[Yu Bao (@August829])](https://github.com/August829) - [email protected] – who works for paypal.com.

References

History

  • 2026-06-10: Initial vulnerability report published.
  • 2026-06-12: Add credit and clarify that no versions other than those listed are affected.

Reporting a vulnerability

To report a security vulnerability for a project within the Spring portfolio, see the Security Policy

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