Heap Overflow Vulnerability in MailEnable Enterprise Premium IMAP Service
CVE-2026-125393

7.1HIGH

Key Information:

Vendor

Mailenable

Status
Mailenable Enterprise Premium
Vendor
CVE Published:
9 November 2026

What is CVE-2026-125393?

MailEnable Enterprise Premium prior to version 10.62 is affected by a heap overflow vulnerability in the IMAP X-FB-FETCH command. This flaw enables authenticated users to exploit a fixed heap buffer of 0x400 bytes, allowing them to provide an excessively long X-FB-USER address exceeding 1016 bytes without adequate length checks. This can lead to a service crash, resulting in denial of service, thereby compromising the stability of the IMAP service.

Affected Version(s)

MailEnable Enterprise Premium 0 < 10.62

References

https://www.mailenable.com/Premium-ReleaseNotes.txt
release-notes
https://www.vulncheck.com/advisories/mailenable-enterpris...
third-party-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jobe Predo
.