# CVE-2026-42171

> Vulnerability · severity: **HIGH** (CVSS 7.8).

## 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).

## Key facts

- **CVE ID:** CVE-2026-42171
- **Published:** 2026-04-24
- **CVSS severity:** HIGH
- **CVSS base score:** 7.8
- **CWE codes:** CWE-427

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42171

## Citation

> AI Analytics. CVE-2026-42171. Retrieved 2026-07-22 from https://api.ai-analytics.org/cve/CVE-2026-42171. Derived from NIST NVD. Licensed CC0.

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