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CVE-2026-43864

Quick assessment

Affected
mutt mutt
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.

mutt是mutt开源的一个从终端发送邮件的命令行电子邮件客户端。 mutt 2.3.2之前版本存在代码问题漏洞，该漏洞源于show_sig_summary存在空指针取消引用。

CVSS 2.5 · Low EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1200 · Hardware Additions

Affected Version Matrix 1

VendorProduct Version RangeStatus
mutt mutt < 2.3.2 affected
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I. Basic Information for CVE-2026-43864

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
mutt before 2.3.2 has a show_sig_summary NULL pointer dereference.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
mutt 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mutt是mutt开源的一个从终端发送邮件的命令行电子邮件客户端。 mutt 2.3.2之前版本存在代码问题漏洞，该漏洞源于show_sig_summary存在空指针取消引用。
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
mutt mutt 0 ~ 2.3.2 -

II. Public POCs for CVE-2026-43864

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III. Intelligence Information for CVE-2026-43864

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Patches & Fixes for CVE-2026-43864 (1)

Same Patch Batch · mutt · 2026-05-04 · 6 CVEs total

CVE-2026-43862 3.7 LOW mutt 安全漏洞
CVE-2026-43860 3.7 LOW mutt 安全漏洞
CVE-2026-43859 3.7 LOW mutt 安全漏洞
CVE-2026-43861 3.7 LOW mutt 安全漏洞
CVE-2026-43863 3.7 LOW mutt 安全漏洞

IV. Related Vulnerabilities

Same product: mutt
Same vendor: mutt
Same weakness: CWE-476

V. Comments for CVE-2026-43864

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