Threat database

CVE-2026-42171 is a high-severity vulnerability in Nullsoft Scriptable Install System (NSIS) versions before 3.12, specifically 3.06.1. The issue arises because NSIS sometimes uses the Low Integrity Level (IL) temporary directory when running as SYSTEM. This behavior can allow a local attacker to gain elevated privileges if they can manipulate the function my_GetTempFileName to return 0. The vulnerability is categorized as CWE-427, indicating an uncontrolled search path element. No official patch or remediation guidance is currently available from the vendor.

CVE-2025-43715 is a local privilege escalation vulnerability in Nullsoft Scriptable Install System (NSIS) on Windows versions before 3.11. It arises from improper handling of the temporary plugins directory creation under %WINDIR%\temp, allowing unprivileged users to exploit a race condition and escalate privileges to SYSTEM during installation.