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CVE-2026-40992 Spring Boot

Affected softwareSpring Boot
Severity5.0 Medium CVSS 3.1
Fixed in4.0.7, 3.5.15
WeaknessCWE-295
Published11 Jun 2026
Updated4 Sep 2026

Description

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.12% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update October 2026 ↗ CPU 2026-Q4 Oracle Communications / Core (Spring Boot) (6.1.1-7.0.0)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Core (Spring Boot) 6.1.1-7.0.0

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.springframework.boot:spring-boot-starter-mail 4.0.0 4.0.7 unbounded
org.springframework.boot:spring-boot-starter-mail 3.5.0 3.5.15 unbounded
org.springframework.boot:spring-boot-starter-mail 3.4.0 none 3.4.16

Products and versions

2 products, 6 version entries
SourceVendorProductSchemeAffected versions
osv org.springframework.boot spring-boot-starter-mail generic ≥ 3.4.0 and ≤ 3.4.16 · ≥ 3.5.0 and < 3.5.15 · ≥ 4.0.0 and < 4.0.7
nvd vmware spring boot generic ≥ 3.4.0 and < 3.4.17 · ≥ 3.5.0 and < 3.5.14.1 · ≥ 4.0.0 and < 4.0.6.1

References

URLTags
https://github.com/spring-projects/spring-boot PACKAGE
https://spring.io/security/cve-2026-40992 WEB

Timeline

Published2026-06-11By the CVE Program.
NVD record modified2026-09-04NVD's own last-modified date for this record.