CVE-2026-42171
7.8
HIGH
CVSS 3.1
EPSS 0.21%
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).
How to fix CVE-2026-42171
No fixed version has been published yet. Mitigate by removing the affected package or applying upstream guidance from the references below.
- Debian/nsis—no fix listed
Is CVE-2026-42171 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |