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CVE-2026-48840

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 4.88版本至4.99.4之前版本存在安全漏洞，该漏洞源于在某些代理配置中错误处理某些短有效载荷，导致未初始化堆栈内存值泄露给客户端。

CVSS 5.3 · Medium EPSS 0.26% · P18

Possible ATT&CK Techniques 1 AI

T1557.002 · ARP Cache Poisoning

Affected Version Matrix 1

VendorProduct Version RangeStatus
Exim Exim 4.88< 4.99.4 affected
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I. Basic Information for CVE-2026-48840

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未进行最小值检查的数值范围比较
Source: CVE Program / CVE List V5
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 4.88版本至4.99.4之前版本存在安全漏洞，该漏洞源于在某些代理配置中错误处理某些短有效载荷，导致未初始化堆栈内存值泄露给客户端。
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 ~ 4.99.4 -

II. Public POCs for CVE-2026-48840

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III. Intelligence Information for CVE-2026-48840

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Vendor Advisories for CVE-2026-48840 (1)

Mailing List Discussions for CVE-2026-48840 (1)

IV. Related Vulnerabilities

Same product: Exim
Same vendor: Exim
Same weakness: CWE-839

V. Comments for CVE-2026-48840

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