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CVE-2026-40687

CVSS 4.8 · Medium EPSS 0.08% · P23
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I. Basic Information for CVE-2026-40687

Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
资源初始化缺失
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SPA认证驱动程序处理对抗性SPA资源时，可能导致越界写入导致连接实例崩溃，或错误数据处理泄露未初始化堆内存数据。
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

VendorProductAffected VersionsCPESubscribe
EximExim 0 ~ 4.99.2 -

II. Public POCs for CVE-2026-40687

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III. Intelligence Information for CVE-2026-40687

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Same Patch Batch · Exim · 2026-04-30 · 4 CVEs total

CVE-2026-406856.5 MEDIUMExim 缓冲区错误漏洞
CVE-2026-406845.9 MEDIUMExim 安全漏洞
CVE-2026-406863.7 LOWExim 缓冲区错误漏洞

IV. Related Vulnerabilities

Same product: Exim
Same vendor: Exim
Same weakness: CWE-909

V. Comments for CVE-2026-40687

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