CVE-2026-40992

EUVD-2026-36203
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5 MEDIUM
ADJACENT_NETWORK
HIGH
NONE
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 2.4%
Affected Products (NVD)
VendorProductVersion
vmwarespring_boot
3.4.0 ≤
𝑥
< 3.4.17
vmwarespring_boot
3.5.0 ≤
𝑥
< 3.5.14.1
vmwarespring_boot
4.0.0 ≤
𝑥
< 4.0.6.1
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://spring.io/security/cve-2026-40992