What is CVE-2026-40992?

CVE-2026-40992 is a medium-severity vulnerability in Spring Boot, classified under Improper Certificate Validation. CVSS score: 5.0/10. Published 2026-06-11.

How severe is CVE-2026-40992?

Medium severity. CVSS v3 base score is 5.0 out of 10.

Vulnerability in Spring Boot

CVE-2026-40992

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…

Vulnerability class: Improper Certificate Validation

EPSS: 0.001 (2.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

Spring Boot — versions 4.0.0, 3.5.0, 3.4.0

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

security@vmware.com

Frequently asked questions

What is CVE-2026-40992?: CVE-2026-40992 is a medium-severity vulnerability in Spring Boot, classified under Improper Certificate Validation. CVSS score: 5.0/10. Published 2026-06-11.
How severe is CVE-2026-40992?: Medium severity. CVSS v3 base score is 5.0 out of 10.