CVE-2026-40992

Mail Auto-Configuration Does Not Enable SSL Hostname Verification

State: Published
Severity: 5.0 Medium
Published: Jun 11, 2026
Updated: Jun 23, 2026
Reserved: Apr 16, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.0 Medium	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L	vmware

Weaknesses

CWE-295 Improper Certificate Validation

Affected Products

Product	Versions
Spring BootSpring	4.0.0 to before 4.0.6.1Affected 3.5.0 to before 3.5.14.1Affected 3.4.0 to before 3.4.17Affected

References

https://spring.io/security/cve-2026-40992

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