CVE-2026-107580— hMailServer 算法复杂度低漏洞
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。
在 Progressive Robot hMailServer 6.0.0 至 6.3.5 版本中，消息头字段的解码过程存在低效的算法复杂度问题，远程未认证攻击者可通过发送特定消息，导致 IMAP、SMTP、POP3 服务或 Webmail 不可用。服务器在解码展开头字段值时，采用从值末尾逐行查找换行符并移除的方式，每次移除后需将剩余部分整体移动，使得处理工作量随换行符数量的平方增长。而根据 RFC 2047 编码的词可解码为任意数量的换行符。 当收到消息的主题（Subject）或其他头字段包含此类值时，每次读取该
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一、 漏洞 CVE-2026-107580 基础信息
漏洞信息
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Vulnerability Title
Inefficient Algorithmic Complexity in hMailServer
来源: CVE Program / CVE List V5
Vulnerability Description
Inefficient algorithmic complexity in the decoding of message header fields in Progressive Robot hMailServer 6.0.0 through 6.3.5 allows a remote unauthenticated attacker to make the IMAP, SMTP and POP3 services, or the webmail, unavailable by sending a message. The server unfolded a decoded header value by finding each line break from the end of the value and removing it, moving the rest of the value each time, so its work grew with the square of the number of line breaks, and an RFC 2047 encoded word may decode to any number of them. A received message whose Subject or other header field holds such a value keeps a worker thread busy for minutes or longer each time the value is read: when the recipient's IMAP client searches, sorts or threads the folder by a header, when the webmail lists the folder, and, where configured, when a rule tests a header, a spam tag is added to the Subject or an abuse report is read during delivery. The IMAP worker threads are shared with SMTP and POP3, so a few such messages stop those services responding. The server's reading of a message header from its file also searched everything read so far after each 4,000 bytes, costing seconds for a header of tens of megabytes.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
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-2026-107580 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-107580 其他参考 (2)
同批安全公告 · Progressive Robot Ltd · 2026-10-08 · 共 22 条
| CVE-2026-103647 | 8.0 HIGH | hMailServer 跨站脚本漏洞 |
| CVE-2026-103010 | 7.8 HIGH | hMailServer 堆缓冲区溢出漏洞 |
| CVE-2026-104660 | 7.8 HIGH | hMailServer 缺少授权漏洞 |
| CVE-2026-104658 | 7.8 HIGH | hMailServer 安全决策依赖不可信输入漏洞 |
| CVE-2026-107573 | 7.8 HIGH | hMailServer 默认权限配置错误漏洞 |
| CVE-2026-107577 | 7.5 HIGH | hMailServer 无限循环漏洞 |
| CVE-2026-107574 | 7.5 HIGH | hMailServer 低效算法复杂度漏洞 |
| CVE-2026-107579 | 7.5 HIGH | hMailServer 算法复杂度低效漏洞 |
| CVE-2026-107576 | 7.5 HIGH | hMailServer 算法复杂度低效漏洞 |
| CVE-2026-104659 | 7.5 HIGH | hMailServer 邮件验证错误 |
| CVE-2026-103649 | 7.5 HIGH | hMailServer 同步访问远程资源无超时漏洞 |
| CVE-2026-107584 | 7.4 HIGH | hMailServer 安全失败机制缺陷 |
| CVE-2026-104704 | 7.4 HIGH | hMailServer 敏感信息明文传输漏洞 |
| CVE-2026-107578 | 6.7 MEDIUM | hMailServer 链接解析不当导致远程代码执行漏洞 |
| CVE-2026-107583 | 6.5 MEDIUM | hMailServer 算法复杂度低效漏洞 |
| CVE-2026-107572 | 6.5 MEDIUM | hMailServer 正则表达式复杂度低效漏洞 |
| CVE-2026-107581 | 6.5 MEDIUM | hMailServer 算法复杂度低效漏洞 |
| CVE-2026-107582 | 6.5 MEDIUM | hMailServer 算法复杂度低效漏洞 |
| CVE-2026-103011 | 6.5 MEDIUM | hMailServer 堆缓冲区溢出漏洞 |
| CVE-2026-107587 | 5.9 MEDIUM | hMailServer 证书验证不当漏洞 |
显示前 20 条，共 22 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-107580
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