CVE catalog

CVE-2026-42171

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_GetTem

[CVE catalog]

Severity: High · CVSS 7.8CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: Apr 24, 2026, 10:16:01 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.21% · Oct 25, 2026

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	nsis	sid	`3.12-1`	fixed
Debian	nsis	forky	`3.12-1`	fixed
Debian	nsis	trixie	`3.11-1`	vulnerable
Debian	nsis	bookworm	`3.08-3+deb12u1`	vulnerable
Cpe	nsis	Not reported	Not reported	vulnerable
Cpe	nullsoft_scriptable_install_system	Not reported	`3.12`	fixed
Cpe	nullsoft_scriptable_install_system	Not reported	`3.12`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	nsis	source	sid	`3.12-1`	not yet assigned	Not reported	[1134955]
Debian	nsis	source	forky	`3.12-1`	not yet assigned	Not reported	[1134955]
Debian	nsis	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1134955]
Debian	nsis	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1134955]
Cpe	nullsoft_scriptable_install_system	cpe	Not reported	`3.12`	Not reported	Not reported	Not reported
Cpe	nullsoft_scriptable_install_system	cpe	Not reported	`3.12`	Not reported	NVD-CVE-2026-42171	Not reported

[Debian bug #1134955]

Notes

[trixie] nsis: Minor issue [bookworm] nsis: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[nsis]Affected
Details (2)
- 3.08-3+deb12u1 · amd64 · bookworm
  Affected
  nvd · nsis · debian · bookworm; nvd · nsis · debian · 12
- 3.08-3+deb12u1 · arm64 · bookworm
  Affected
  nvd · nsis · debian · bookworm; nvd · nsis · debian · 12
[nsis-common]Affected
Source package: [nsis]
Details (2)
- 3.08-3+deb12u1 · all · bookworm
  Affected
  nvd · nsis · debian · bookworm; nvd · nsis · debian · 12
- 3.08-3+deb12u1 · all · bookworm
  Affected
  nvd · nsis · debian · bookworm; nvd · nsis · debian · 12
[nsis-doc]Affected
Source package: [nsis]
Details (2)
- 3.08-3+deb12u1 · all · bookworm
  Affected
  nvd · nsis · debian · bookworm; nvd · nsis · debian · 12
- 3.08-3+deb12u1 · all · bookworm
  Affected
  nvd · nsis · debian · bookworm; nvd · nsis · debian · 12
[nsis-pluginapi]Affected
Source package: [nsis]
Details (2)
- 3.08-3+deb12u1 · all · bookworm
  Affected
  nvd · nsis · debian · bookworm; nvd · nsis · debian · 12
- 3.08-3+deb12u1 · all · bookworm
  Affected
  nvd · nsis · debian · bookworm; nvd · nsis · debian · 12

[Debian 13 (Trixie)]

[nsis]Affected
Details (2)
- 3.11-1 · amd64 · trixie
  Affected
  nvd · nsis · debian · 13
- 3.11-1 · arm64 · trixie
  Affected
  nvd · nsis · debian · 13
[nsis-common]Affected
Source package: [nsis]
Details (2)
- 3.11-1 · all · trixie
  Affected
  nvd · nsis · debian · 13
- 3.11-1 · all · trixie
  Affected
  nvd · nsis · debian · 13
[nsis-doc]Affected
Source package: [nsis]
Details (2)
- 3.11-1 · all · trixie
  Affected
  nvd · nsis · debian · 13
- 3.11-1 · all · trixie
  Affected
  nvd · nsis · debian · 13
[nsis-pluginapi]Affected
Source package: [nsis]
Details (2)
- 3.11-1 · all · trixie
  Affected
  nvd · nsis · debian · 13
- 3.11-1 · all · trixie
  Affected
  nvd · nsis · debian · 13

Observed: Oct 26, 2026, 9:21:52 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]