CVE-2026-42171

Low IL Temp Directory Path Exposure Allows Local Privilege Escalation

Published Apr 24, 2026 CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
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).

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Low IL Temp Directory Path Exposure Allows Local Privilege Escalation
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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).
First Time appeared Nullsoft
Nullsoft nullsoft Scriptable Install System
Weaknesses CWE-427
CPEs cpe:2.3:a:nullsoft:nullsoft_scriptable_install_system:*:*:*:*:*:*:*:*
Vendors & Products Nullsoft
Nullsoft nullsoft Scriptable Install System
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Apr 25, 2026, 7:33 PM
Reserved
Apr 24, 2026, 9:20 PM
Status
Analyzed
Published
Apr 24, 2026, 10:16 PM
Modified
Oct 26, 2026, 9:10 PM