Answer in brief
CVE-2026-40992 records a Medium severity (CVSS 5.0) vulnerability in Mail Auto-Configuration Does Not Enable SSL Hostname Verification. The current sources do not mark it as known exploited. The current feed maps Spring/Spring Boot (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Spring/Spring Boot (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Spring/Spring Bootgeneric | >=4.0.0 <4.0.6.1 || >=3.5.0 <3.5.14.1 || >=3.4.0 <3.4.17 | 4.0.6.1, 3.5.14.1, 3.4.17 |
Published upstream
Jun 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 23, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-40992 records a Medium severity (CVSS 5.0) vulnerability in Mail Auto-Configuration Does Not Enable SSL Hostname Verification. The current sources do not mark it as known exploited. The current feed maps Spring/Spring Boot (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Spring/Spring Boot (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Spring/Spring Bootgeneric | >=4.0.0 <4.0.6.1 || >=3.5.0 <3.5.14.1 || >=3.4.0 <3.4.17 | 4.0.6.1, 3.5.14.1, 3.4.17 |
Published upstream
Jun 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jun 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 23, 2026
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.
Quoted source text, attributed separately from HOL analysis.