CVE-2026-40684
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I. Basic Information for CVE-2026-40684
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance when malformed DNS data is present in PTR records. This is caused by a dn_expand oddity in octal printing.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
特定函数功能的不正确供给
Source: NVD (National Vulnerability Database)
Vulnerability Title
Exim 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Exim是Exim开源的一个运行于Unix系统中的开源消息传送代理（MTA），它主要负责邮件的路由、转发和投递。 Exim 4.99.2之前版本存在安全漏洞，该漏洞源于在musl libc系统上处理PTR记录中的畸形DNS数据时，dn_expand的八进制打印异常可能导致连接实例崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-40684
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Exim · 2026-04-30 · 4 CVEs total
| CVE-2026-40685 | 6.5 MEDIUM | Exim 缓冲区错误漏洞 |
| CVE-2026-40687 | 4.8 MEDIUM | Exim 安全漏洞 |
| CVE-2026-40686 | 3.7 LOW | Exim 缓冲区错误漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-40684
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