Quick answers
- Is CVE-2026-125393 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-125393 being exploited in the wild.
- How severe is CVE-2026-125393?
- Medium severity, with a CVSS score of 6.5, published 10 November 2026.
- Which products and versions are affected?
- MailEnable Enterprise Premium before 10.62.
- Is there a fix for CVE-2026-125393?
- Yes: fixed in 10.62. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-125393 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-125393?
- Check whether you run MailEnable Enterprise Premium at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 10.62
Technical details
A heap-based buffer overflow exists in the IMAP X-FB-FETCH command handler when processing the X-FB-USER parameter without length validation. An authenticated attacker can supply an X-FB-USER address longer than approximately 1016 bytes to overflow a fixed 0x400-byte heap buffer, crashing the IMAP service. The vulnerability requires valid user credentials to exploit.
Affected products
- MailEnable Enterprise Premium before 10.62
Timeline
- 2026-11-10: disclosed
- 2026-11-03: patched