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CVE-2026-42171

HIGH
7.8
CVSS Score
Published: April 24, 2026 at 09:20 PM UTC
Updated: June 17, 2026 at 10:47 AM UTC
1 product affected across 1 vendorNullsoft Scriptable Install System

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nullsoft Scriptable Install System· Nullsoft
95%
3.06.1 ≤ v < 3.123.06.1
Affected range stops below 3.12, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Release Notes
Source: cverecord
https://nsis.sourceforge.io/Docs/AppendixF.html#v3.12-cl
Patch
Source: cverecord
https://github.com/NSIS-Dev/nsis/commit/8e6f02205d5f22da6c7855dbfe59b2af667330ca
Product
Source: cverecord
https://github.com/NSIS-Dev/nsis/blob/7359413009afd4f0fff472d841fc2f2cc0e0a5f8/Source/exehead/util.c#L475-L484
Product
Source: cverecord
https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-gettempfilename

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHmitre
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-427

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