What is the CVSS score of CVE-2026-42171?

CVE-2026-42171 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Is there a patch available for CVE-2026-42171?

Yes, a patch is available for CVE-2026-42171. Update the affected software to the latest version immediately.

Nullsoft Scriptable Install System CVE-2026-42171

EUVD-2026-25637 HIGH

Uncontrolled Search Path Element (CWE-427)

2026-04-24 mitre

Information Disclosure Nullsoft Scriptable Install System

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Apr 27, 2026 - 18:57 nvd

Patch available

Apr 24, 2026 - 23:02 EUVD

EUVD ID Assigned

Apr 24, 2026 - 22:00 euvd

EUVD-2026-25637

CVE Published

Apr 24, 2026 - 21:20 nvd

HIGH 7.8

DescriptionCVE.org

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).