Is CVE-2026-42171 actively exploited?

No active exploitation of CVE-2026-42171 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42171 be exploited remotely?

No. CVE-2026-42171 requires local access to exploit.

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

CVE-2026-42171 has a CVSS score of 7.8 (HIGH).

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HIGH

CVE-2026-42171

CWE-427Published: April 24, 2026· Updated: Apr 27, 2026

7.8

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:0.2th

Official Description

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).

NVD Source

Technical Analysis

CVE-2026-42171 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.