CVE-2026-40685
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I. Basic Information for CVE-2026-40685
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
In Exim before 4.99.2, when JSON lookup is enabled, an out-of-bounds heap write can occur when a JSON operator encounters malformed JSON in an untrusted header, because of an incorrect implementation of \ skipping.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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 缓冲区错误漏洞
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之前版本存在缓冲区错误漏洞，该漏洞源于JSON查找功能中JSON运算符处理恶意JSON时，由于反斜杠跳过实现不正确，可能导致堆越界写入。
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-2026-40685
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Exim · 2026-04-30 · 4 CVEs total
| CVE-2026-40684 | 5.9 MEDIUM | Exim 安全漏洞 |
| 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-2026-40685
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