CVE-2026-40992
Low
No strong exploitation signal.
CVSS base
5.0
MEDIUM
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
EPSS — probability of exploitation (30 days)
0.1%
2.4th percentile
CISA KEV
Not listed
Weakness / dates
CWE-295
Published 2026-06-11 · modified 2026-09-04
CVSS breakdown
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
| Attack Vector | A | Adjacent |
| Attack Complexity | H | High |
| Privileges Required | N | None |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | L | Low |
| Integrity | L | Low |
| Availability | L | Low |
Timeline
- 2026-06-11 — Published (NVD)
- 2026-09-04 — Last modified (NVD)
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.