CVE-2026-42171

Summary

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 Software

Weaknesses

• CWE-427: CWE-427 Uncontrolled Search Path Element

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

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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