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CVE-2026-40685

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。

CVSS 6.5 · Medium EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Exim Exim < 4.99.2 affected
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I. Basic Information for CVE-2026-40685

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特定函数功能的不正确供给
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Exim Exim 0 ~ 4.99.2 -

II. Public POCs for CVE-2026-40685

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-40685

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Patches & Fixes for CVE-2026-40685 (1)

Vendor Advisories for CVE-2026-40685 (1)

Mailing List Discussions for CVE-2026-40685 (1)

Other References for CVE-2026-40685 (1)

Other References for CVE-2026-40685 (1)

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

Same product: Exim
Same vendor: Exim
Same weakness: CWE-684

V. Comments for CVE-2026-40685

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