6.8

CVE-2026-40970: spring spring boot Improper Certificate Validation

CVSS: 6.8v3.1MediumAnalyzed
AliasesGHSA-c96x-rpm4-349p
Published 27-04-2026Last modified 27-04-2026
Open JSON

Vulnerability summary

CVE-2026-40970 is a medium (CVSS 6.8) Improper Certificate Validation vulnerability in spring spring boot. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.3% of scored vulnerabilities.

Overall risk
27/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.8/10
010
Medium · v3.1 (NVD)
EPSS score
0.21%
0%100%
Low · +0.07 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 27-04-2026
    PublishedVulnerability first disclosed.
  2. 27-04-2026
    Last modifiedVulnerability information updated.

Description

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 vendor advisory.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

+0.07 pp

From 0.14% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.21%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Org.springframework.boot1 product
  • spring-boot-elasticsearch≥ 4.0.0, < 4.0.6
Spring1 product
Vmware1 product

3 vendors · 3 products

References

4 links