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CVE-2026-42171

Quick assessment

Affected
Nullsoft Nullsoft Scriptable Install System
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.

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。

CVSS 7.8 · High EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2026-42171

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对搜索路径元素未加控制
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Nullsoft Nullsoft 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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Vendor Advisories for CVE-2026-42171 (1)

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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