CVE-2026-40992

MEDIUM

Mail Auto-Configuration Does Not Enable SSL Hostname Verification

Title source: cna

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.

References (1)

Core 1

Core References

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

Scores

CVSS v3 5.0

EPSS 0.0012

EPSS Percentile 2.4%

Attack Vector ADJACENT_NETWORK

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-295

Status published

Products (3)

Spring/Spring Boot 3.4.0 - 3.4.17

Spring/Spring Boot 3.5.0 - 3.5.15

Spring/Spring Boot 4.0.0 - 4.0.7

Published Jun 11, 2026

Tracked Since Jun 11, 2026