CVE-2026-107569— hMailServer 循环条件未检查输入漏洞
一分钟漏洞结论
影响对象
Progressive Robot Ltd hMailServer
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Progressive Robot hMailServer 6.0.0 至 6.3.6 版本中，循环条件存在未检查的输入漏洞，允许远程未认证攻击者中断邮件服务器的正常邮件处理。该服务器在响应各类邮件操作（包括规则转发、回复或抄送、账户转发、Sieve 重定向、度假回复或通知、退信、自动外出回复等）时，会依据消息中 头字段所携带的计数器，对生成的邮件数量进行限制；一旦该计数器达到配置的规则循环上限（默认为 5），服务器将停止进一步生成邮件，从而在有限跳数内终结转发或自动回复循环。 然而， 是一个普通邮件头字段，不会从
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一、 漏洞 CVE-2026-107569 基础信息
漏洞信息
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Vulnerability Title
Unchecked Input for Loop Condition in hMailServer
来源: CVE Program / CVE List V5
Vulnerability Description
Unchecked input for a loop condition in Progressive Robot hMailServer 6.0.0 through 6.3.6 allows a remote unauthenticated attacker to stop the server carrying mail. The server bounds the mail it generates in response to a message - a rule forward, reply or copy, an account forward, a Sieve redirect, vacation or notify, a bounce, an out-of-office reply - by a counter it carries in the message's X-hMailServer-LoopCount header, and makes no more once the counter reaches the configured rule loop limit (5 by default); that is what ends a forwarding or auto-reply cycle in a bounded number of hops. X-hMailServer-LoopCount is an ordinary header that is not stripped from mail arriving from outside, and the server read it with a signed conversion and no validation, so a count below zero passed every test against the limit: a sender who sets X-hMailServer-LoopCount to a negative value, or on the Linux builds to a value above the 32-bit signed range that the conversion wraps to a negative one, lifts the bound, and a message that enters a generated-mail cycle then loops up to about two thousand million times, each hop a queued message and a delivery, filling the queue and disk and stopping mail service. The Sieve notify action (from 6.2.22) consulted no limit at all, and its increment of the count could overflow a signed integer; and an account could reset the counter on its own mail through a Sieve editheader of the header (from 6.2.22) or a rule Set header value action (all versions) ahead of a forward or redirect.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
循环条件输入未经检查
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| Progressive Robot Ltd | hMailServer | 6.0.0 ~ 6.3.6 | - |
|
二、漏洞 CVE-2026-107569 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-107569 其他参考 (2)
同批安全公告 · Progressive Robot Ltd · 2026-10-19 · 共 5 条
| CVE-2026-107571 | 7.8 HIGH | hMailServer 默认权限配置不当漏洞 |
| CVE-2026-107567 | 7.5 HIGH | hMailServer 使用低信任源漏洞 |
| CVE-2026-107568 | 6.5 MEDIUM | hMailServer 身份验证缺失漏洞 |
| CVE-2026-107566 | 6.5 MEDIUM | hMailServer 认证缺失漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-107569
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