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CVE-2026-42171

CVSS 7.8 · High EPSS 0.01% · P0
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I. Basic Information for CVE-2026-42171

Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
NSIS (Nullsoft Scriptable Install System) 3.06.1 before 3.12 sometimes uses the Low IL temp directory when executing as SYSTEM, allowing local attackers to gain privileges (if they can cause my_GetTempFileName to return 0, as shown in the references).
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对搜索路径元素未加控制
Source: NVD (National Vulnerability Database)
Vulnerability Title
NSIS 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NSIS是NSIS Development开源的一个创建Windows安装程序的工具。 NSIS 3.06.1版本至3.12之前版本存在代码问题漏洞，该漏洞源于以SYSTEM身份执行时有时使用低IL临时目录，允许本地攻击者提升权限。
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

VendorProductAffected VersionsCPESubscribe
NullsoftNullsoft Scriptable Install System 3.06.1 ~ 3.12 -

II. Public POCs for CVE-2026-42171

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III. Intelligence Information for CVE-2026-42171

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IV. Related Vulnerabilities

Same product: Nullsoft Scriptable Install System
Same vendor: Nullsoft
Same weakness: CWE-427

V. Comments for CVE-2026-42171

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