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TI-2026-30497 Aliases CVE-2026-42171GHSA-594m-24qw-wfmp

Uncontrolled search path in Nullsoft Scriptable Install System

Priority LOW 35CWE-427Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-427.

Summary

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).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0021 11th percentileScored 2026-11-07
Fix Fixed Nullsoft Scriptable Install System (Nullsoft): 3.12

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NullsoftNullsoft Scriptable Install System3.06.1 to before 3.123.12Patch availableCNA
  • Nullsoft Scriptable Install System VendorNullsoft Affected 3.06.1 to before 3.12 Fixed in 3.12 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nullsoft:nullsoft_scriptable_install_system:*:*:*:*:*:*:*:*3.06.1 to before 3.12VulnerableNullsoft
  • cpe:2.3:a:nullsoft:nullsoft_scriptable_install_system:*:*:*:*:*:*:*:* Versions 3.06.1 to before 3.12 Vulnerable ·Nullsoft

Remediation

  • Fix · CNA Nullsoft Scriptable Install System (Nullsoft) Fixed in 3.12

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42171
  2. 2026-10-03 Alias added: GHSA-594m-24qw-wfmp

References

Patch 1

Other 3

  • TI-2015-07646 Nullsoft Scriptable Install System (NSIS) before 2.49 has unsafe implicit linking against… CVSS 3.1HIGH 7.8
  • TI-2023-19004 Nullsoft Scriptable Install System (NSIS) before 3.09 mishandles access control for an uninstaller directory. CVSS 3.1MEDIUM 5.3
  • TI-2015-07645 Nullsoft Scriptable Install System (NSIS) before 2.49 uses temporary folder locations… CVSS 3.1MEDIUM 5.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences