What is CVE-2026-40970?

CVE-2026-40970 is a medium-severity vulnerability in Spring Boot, classified under Improper Certificate Validation. CVSS score: 5.0/10. Published 2026-04-27.

How severe is CVE-2026-40970?

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

Vulnerability in Spring Boot

CVE-2026-40970

When configured to use an SSL bundle, Spring Boot's Elasticsearch auto-configuration does not perform hostname verification when connecting to the Elasticsearch server. Affected: Spring Boot 4.0.0–4.0.5; upgrade to 4.0.6 or later per vend…

Vulnerability class: Improper Certificate Validation

EPSS: 0.000 (8.8th 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
Vmware Spring_boot

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

security@vmware.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-40970?: CVE-2026-40970 is a medium-severity vulnerability in Spring Boot, classified under Improper Certificate Validation. CVSS score: 5.0/10. Published 2026-04-27.
How severe is CVE-2026-40970?: Medium severity. CVSS v3 base score is 5.0 out of 10.