Description
Nullsoft Scriptable Install System (NSIS) before 2.49 uses temporary folder locations that allow unprivileged local users to overwrite files. This allows a local attack in which either a plugin or the uninstaller can be replaced by a Trojan horse program.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nsis | 2.50-1 | — |
| Debian 13 | nsis | 2.50-1 | — |
| Debian 12 | nsis | 2.50-1 | — |
| Debian 8 | nsis | 2.46-10+deb8u1 | DLA-1602-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | nsis | 2.46-7ubuntu0.1~esm1 | — |
Advisories 1
- DLA-1602-1 nsis - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- [debian-lts-announce] 20181130 [SECURITY] [DLA 1602-1] nsis security update mailing-list
- https://sourceforge.net/p/nsis/bugs/1125/
- JVN#68418039 third-party-advisory