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{"cveTags": [], "descriptions": [{"lang": "en", "value": "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)."}], "id": "CVE-2026-42171", "lastModified": "2026-04-24T22:16:01.540", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-04-24T22:16:01.540", "references": [{"source": "cve@mitre.org", "url": "https://github.com/NSIS-Dev/nsis/blob/7359413009afd4f0fff472d841fc2f2cc0e0a5f8/Source/exehead/util.c#L475-L484"}, {"source": "cve@mitre.org", "url": "https://github.com/NSIS-Dev/nsis/commit/8e6f02205d5f22da6c7855dbfe59b2af667330ca"}, {"source": "cve@mitre.org", "url": "https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-gettempfilename"}, {"source": "cve@mitre.org", "url": "https://nsis.sourceforge.io/Docs/AppendixF.html#v3.12-cl"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-427"}], "source": "cve@mitre.org", "type": "Primary"}]}

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