What’s Vulnerable › Vulnerabilities

CVE-2026-40970

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-27 · updated 2026-10-26
• Weakness: CWE-295

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.

Affected products

• Spring Boot: from 4.0.0 before 4.0.6 — fixed in 4.0.6
• Spring Boot: from 4.0.0 before 4.0.6 — fixed in 4.0.6

How to fix

Upgrade to a fixed version: Spring Boot 4.0.6; Spring Boot 4.0.6. Check the vendor advisory for mitigations.

References

• https://spring.io/security/cve-2026-40970

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