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CVE-2026-66140

Quick assessment

Affected
Exim Exim
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Exim是Exim组织开源的一个运行于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 4.99.5之前版本存在路径遍历漏洞，该漏洞源于对队列名称相关参数未正确处理，可能导致目录遍历以访问缓冲池区域之外的文件，进而导致权限提升。

CVSS 8.4 · High EPSS 0.39% · P30

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Exim Exim 4.88< 4.99.5 affected
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I. Basic Information for CVE-2026-66140

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Exim before 4.99.5 allows directory traversal to access files outside of the spool area, and consequently gain privileges, because arguments related to queue-name are mishandled.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
路径遍历：’../filedir’
Source: CVE Program / CVE List V5
Vulnerability Title
Exim 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Exim是Exim组织开源的一个运行于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 4.99.5之前版本存在路径遍历漏洞，该漏洞源于对队列名称相关参数未正确处理，可能导致目录遍历以访问缓冲池区域之外的文件，进而导致权限提升。
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

Vendor Product Affected Versions CPE Subscribe
Exim Exim 4.88 ~ 4.99.5 -

II. Public POCs for CVE-2026-66140

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III. Intelligence Information for CVE-2026-66140

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Mailing List Discussions for CVE-2026-66140 (1)

IV. Related Vulnerabilities

Same product: Exim
Same vendor: Exim
Same weakness: CWE-24

V. Comments for CVE-2026-66140

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