CVE-2026-40970
Spring Boot's Elasticsearch auto-configuration doesn't perform hostname verification when connecting to the Elasticsearch server.
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.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2026-40970- CVSS 3.1
- 5.0 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-295
- Updated
- 2026-11-02
EUVDEUVD-2026-25908
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.
- Record
EUVD-2026-25908- CVSS 3.1
- 5.0 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-c96x-rpm4-349p
Spring Boot's Elasticsearch auto-configuration doesn't perform hostname verification when connecting to the Elasticsearch server.
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.
- Record
GHSA-c96x-rpm4-349p- CVSS 3.1
- 5.0 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-295
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-40970- CVSS 3.1
- 5.0 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L - CVSS 3.1
- 6.8 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-295
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2026-40970- CVSS 3.1
- 5.0 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-295
- Updated
- 2026-11-02
OSVGHSA-c96x-rpm4-349p
Spring Boot's Elasticsearch auto-configuration doesn't perform hostname verification when connecting to the Elasticsearch server.
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.
- Record
GHSA-c96x-rpm4-349p- CVSS 3.1
- 5.0 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-295
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.springframework.boot:spring-boot-elasticsearchMaven |
4.0.0 up to 4.0.6 | 4.0.6 |
org.springframework.boot:spring-boot-elasticsearchMaven |
4.0.0 up to 4.0.6, plus listed versions 4.0.14.0.24.0.34.0.44.0.5 |
4.0.6 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-40970 is a medium vulnerability (CVSS 5.0) in Spring Boot, published April 27, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.14%, the 3rd percentile. Fixed in org.springframework.boot:spring-boot-elasticsearch 4.0.6.