CVE-2026-42171
Fixed in a distro release EPSS <1%CVSS 7.8
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).
Products: Nullsoft Scriptable Install System
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | nsis | no fix |
| Debian 13 | nsis | no fix |
| Debian 14 | nsis | 3.12-1 |
| Ubuntu 16.04 LTS | nsis | no fix |
| Ubuntu 18.04 LTS | nsis | no fix |
| Ubuntu 20.04 LTS | nsis | no fix |
| Ubuntu 22.04 LTS | nsis | no fix |
| Ubuntu 24.04 LTS | nsis | no fix |
| Ubuntu 25.10 | nsis | no fix |
| Ubuntu 26.04 LTS | nsis | no fix |
| Ubuntu 26.10 | nsis | no fix |
| Ubuntu Pro 14.04 LTS | nsis | no fix |