Spring Security Advisories

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CVE-2026-40992: 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

Versions that are no longer supported are also affected.

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.

Affected version(s) Fix version Availability
4.0.x 4.0.7 OSS
4.0.x 4.0.6.1 Enterprise Support Only
3.5.x 3.5.15 OSS
3.5.x 3.5.14.1 Enterprise Support Only
3.4.x 3.4.17 Enterprise Support Only

No further mitigation steps are necessary.

References

History

  • 2026-06-03: Initial vulnerability report published.

Reporting a vulnerability

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

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