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    CVE-2026-42171

    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).

    Published:Apr 24, 2026
    Last Modified:Apr 28, 2026
    EPS:Apr 24, 2026
    EPSS Score:0.00005
    CVSS Score:7.8

    Affected Products

    Vendor
    Nullsoft
    Product
    Nullsoft Scriptable Install System

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-427 Uncontrolled Search Path Element

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High