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CVE-2026-125393— MailEnable Enterprise Premium before 10.62 Heap Overflow via IMAP X-FB-FETCH

Quick assessment

Affected
MailEnable MailEnable Enterprise Premium
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MailEnable Enterprise Premium 10.62 之前的版本在 IMAP 协议的 X-FB-FETCH 命令中存在堆溢出漏洞。该漏洞允许已认证用户溢出一个固定大小为 0x400 字节的堆缓冲区。攻击者可提交长度超过约 1016 字节的 X-FB-USER 地址，由于该数据在格式化时未进行长度检查，从而导致 IMAP 服务崩溃并引发拒绝服务（DoS）攻击。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood
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I. Basic Information for CVE-2026-125393

Vulnerability Information
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Vulnerability Title
MailEnable Enterprise Premium before 10.62 Heap Overflow via IMAP X-FB-FETCH
Source: CVE Program / CVE List V5
Vulnerability Description
MailEnable Enterprise Premium before 10.62 contains a heap overflow vulnerability in the IMAP X-FB-FETCH command that allows authenticated users to overflow a fixed 0x400-byte heap buffer. Attackers can supply an X-FB-USER address longer than about 1016 bytes, which is formatted without a length check, to crash the IMAP service and cause denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MailEnable MailEnable Enterprise Premium 0 ~ 10.62 -

II. Public POCs for CVE-2026-125393

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-125393

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Vendor Pages for CVE-2026-125393 (1)

Other References for CVE-2026-125393 (1)

IV. Related Vulnerabilities

Same product: MailEnable Enterprise Premium
Same vendor: MailEnable
Same weakness: CWE-122