high7.8
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 gai…
Impact
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).
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Nullsoft | Nullsoft Scriptable Install System | from 3.06.1 before 3.12 |
Weakness classification
References
- NVD record
- CVE.org record
- https://github.com/NSIS-Dev/nsis/blob/7359413009afd4f0fff472d841fc2f2cc0e0a5f8/Source/exehead/util.c#L475-L484
- https://github.com/NSIS-Dev/nsis/commit/8e6f02205d5f22da6c7855dbfe59b2af667330ca
- https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-gettempfilename
- https://nsis.sourceforge.io/Docs/AppendixF.html#v3.12-cl