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CVE-2026-94057

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 在 4.100.1 之前的版本存在 SMTP 走私漏洞，其中接收到的消息与发送的消息不匹配，而是依赖于在 DATA 处理过程中被拒绝后发送的精心构造的数据。

CVSS 4.0 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-94057

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead depends on crafted data sent after a rejection during DATA processing.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Exim Exim 0 ~ 4.100.1 -

II. Public POCs for CVE-2026-94057

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III. Intelligence Information for CVE-2026-94057

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Mailing List Discussions for CVE-2026-94057 (1)

Same Patch Batch · Exim · 2026-09-19 · 4 CVEs total

CVE-2026-94056 7.5 HIGH Exim 4.100.1前 Proxy-Protocol 栈未初始化读取
CVE-2026-94054 7.0 HIGH Exim 4.100.1前Proxy-Protocol致越界写入
CVE-2026-94055 3.7 LOW Exim 4.100.1前GnuTLS配置下存在UAF漏洞

IV. Related Vulnerabilities

Same product: Exim
Same vendor: Exim
Same weakness: CWE-93

V. Comments for CVE-2026-94057

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