TI-2026-29643 Aliases CVE-2026-40992 GHSA-9wxp-w4px-32vh

Mail Auto-Configuration Does Not Enable SSL Hostname Verification

LOW 22CWE-295Published 2026-06-11 · Updated 2026-06-23

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Spoofing
Confidentiality · integrity · availability: Low · Low · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-295.

Summary

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: Spring Boot 4.0.0 through 4.0.6; 3.5.0 through 3.5.14; 3.4.0 through 3.4.16.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00124 2nd percentileScored 2026-11-07

Fix Fixed Spring Boot (Spring): 4.0.6.1, 3.5.14.1, 3.4.17org.springframework.boot:spring-boot-starter-mail (Maven): 4.0.7, 3.5.15

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
VMware	Spring Boot	4.0.0 to before 4.0.6.1; 3.5.0 to before 3.5.14.1; 3.4.0 to before 3.4.17	4.0.6.1, 3.5.14.1, 3.4.17	Patch available	CNA
—	org.springframework.boot:spring-boot-starter-mail (Maven)	4.0.0 to before 4.0.7	4.0.7	Patch available	GHSA-9wxp-w4px-32vh
—	org.springframework.boot:spring-boot-starter-mail (Maven)	3.5.0 to before 3.5.15	3.5.15	Patch available	GHSA-9wxp-w4px-32vh
—	org.springframework.boot:spring-boot-starter-mail (Maven)	3.4.0 – 3.4.16	—	No fix listed	GHSA-9wxp-w4px-32vh

Spring Boot VendorVMware Affected 4.0.0 to before 4.0.6.1; 3.5.0 to before 3.5.14.1; 3.4.0 to before 3.4.17 Fixed in 4.0.6.1, 3.5.14.1, 3.4.17 Patch available CNA
org.springframework.boot:spring-boot-starter-mail (Maven) Vendor— Affected 4.0.0 to before 4.0.7 Fixed in 4.0.7 Patch available GHSA-9wxp-w4px-32vh
org.springframework.boot:spring-boot-starter-mail (Maven) Vendor— Affected 3.5.0 to before 3.5.15 Fixed in 3.5.15 Patch available GHSA-9wxp-w4px-32vh
org.springframework.boot:spring-boot-starter-mail (Maven) Vendor— Affected 3.4.0 – 3.4.16 Fixed in — No fix listed GHSA-9wxp-w4px-32vh

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:vmware:spring_boot::::::::	3.4.0 to before 3.4.17; 3.5.0 to before 3.5.14.1; 4.0.0 to before 4.0.6.1	Vulnerable	VMware

cpe:2.3:a:vmware:spring_boot:*:*:*:*:*:*:*:* Versions 3.4.0 to before 3.4.17; 3.5.0 to before 3.5.14.1; 4.0.0 to before 4.0.6.1 Vulnerable ·VMware

Remediation

Fix · CNA Spring Boot (Spring) Fixed in 4.0.6.1, 3.5.14.1, 3.4.17
Fix · GHSA-9wxp-w4px-32vh org.springframework.boot:spring-boot-starter-mail (Maven) Fixed in 4.0.7 Advisory →
Fix · GHSA-9wxp-w4px-32vh org.springframework.boot:spring-boot-starter-mail (Maven) Fixed in 3.5.15 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-40992
2026-10-03 Alias added: GHSA-9wxp-w4px-32vh

References

Advisory 2

Other 1

https://github.com/spring-projects/spring-boot

TI-2017-05637 Improper input validation in Pivotal Spring Data REST and Spring Boot CVSS 3.0CRITICAL 9.8
TI-2023-07292 In Spring Boot versions 3.0.0 - 3.0.5, 2.7.0 - 2.7.10, and older unsupported versions, an… CVSS 3.1CRITICAL 9.8
TI-2026-29627 Missing authorization in VMware Spring Boot CVSS 3.1CRITICAL 9.1
TI-2021-08570 Element Plug-in for vCenter Server incorporates SpringBoot Framework. CVSS 3.1CRITICAL 9.8
TI-2026-18258 Authentication Bypass under Actuator CloudFoundry endpoints CVSS 3.1HIGH 8.2
TI-2026-18256 Authentication Bypass under Actuator Health groups paths CVSS 3.1HIGH 8.2

See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences