CVE-2026-42171
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th
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).
| CWE | CWE-427 |
| Vendor | nullsoft |
| Product | nullsoft scriptable install system |
| Published | Apr 24, 2026 |
| Last Updated | Apr 24, 2026 |
Stay Ahead of the Next One
Get instant alerts for nullsoft nullsoft scriptable install system
Be the first to know when new high vulnerabilities affecting nullsoft nullsoft scriptable install system are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Nullsoft / Nullsoft Scriptable Install System
3.06.1 < 3.12
References
nsis.sourceforge.io: https://nsis.sourceforge.io/Docs/AppendixF.html#v3.12-cl github.com: https://github.com/NSIS-Dev/nsis/commit/8e6f02205d5f22da6c7855dbfe59b2af667330ca github.com: https://github.com/NSIS-Dev/nsis/blob/7359413009afd4f0fff472d841fc2f2cc0e0a5f8/Source/exehead/util.c#L475-L484 learn.microsoft.com: https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-gettempfilename