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CVE-2026-94056

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.

在 Exim 4.100.1 之前，当使用 Proxy-Protocol 并与攻击者控制的代理配合使用时，攻击者能够读取栈内存中某些未初始化的数据。

CVSS 7.5 · High
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I. Basic Information for CVE-2026-94056

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, allows attackers to read certain uninitialized data from stack memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Exim Exim 4.83 ~ 4.100.1 -

II. Public POCs for CVE-2026-94056

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III. Intelligence Information for CVE-2026-94056

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Mailing List Discussions for CVE-2026-94056 (1)

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

CVE-2026-94054 7.0 HIGH Exim 4.100.1前Proxy-Protocol致越界写入
CVE-2026-94057 4.0 MEDIUM Exim 4.100.1 前 SMTP 走私漏洞
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-908

V. Comments for CVE-2026-94056

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