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CVE-2026-42171

HIGH

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).

Details CVE

Score CVSS v3.17.8

SeveriteHIGH

Vecteur CVSSCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Vecteur d'attaqueLOCAL

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurREQUIRED

Publie4/24/2026

Derniere modification4/24/2026

Sourcenvd

Observations honeypot0

Faiblesses (CWE)

CWE-427

References

https://github.com/NSIS-Dev/nsis/blob/7359413009afd4f0fff472d841fc2f2cc0e0a5f8/Source/exehead/util.c#L475-L484(cve@mitre.org)

https://github.com/NSIS-Dev/nsis/commit/8e6f02205d5f22da6c7855dbfe59b2af667330ca(cve@mitre.org)

https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-gettempfilename(cve@mitre.org)

https://nsis.sourceforge.io/Docs/AppendixF.html#v3.12-cl(cve@mitre.org)

Correlations IOC

Aucune correlation enregistree

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