CVE-2026-42171
- State
- Published
- Severity
- 7.8 High
- Published
- Apr 24, 2026
- Updated
- Apr 25, 2026
- Reserved
- Apr 24, 2026
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).
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.8 High | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | mitre |
Weaknesses
- CWE-427 Uncontrolled Search Path Element
Affected Products
| Product | Versions |
|---|---|
Nullsoft Scriptable Install SystemNullsoft |
|
References
- https://nsis.sourceforge.io/Docs/AppendixF.html#v3.12-cl
- https://github.com/NSIS-Dev/nsis/commit/8e6f02205d5f22da6c7855dbfe59b2af667330ca
- https://github.com/NSIS-Dev/nsis/blob/7359413009afd4f0fff472d841fc2f2cc0e0a5f8/Source/exehead/util.c#L475-L484
- https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-gettempfilename
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