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No exploitation reportedFix available

CVE-2026-42171

No exploitation reported by the sources we read.

  • Published2026-04-24
  • Fixed in3.12
  • WeaknessCWE-427

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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).

Timeline

dates in UTC
  1. 2026-04-2422:16CVE publishedNVD

Versions per branch

NVD
Nullsoft nullsoft scriptable install system
BranchAffectedFixed in
3.x≥ 3.06.1, < 3.123.12

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As mitre, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Nullsoft Scriptable Install Systemother versions: not affected
    Affected
    • ≥ 3.06.1, < 3.12fixed in 3.12custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-04-25

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • nsisUbuntu:Pro:14.04:LTSall versions · no fixed version listed
  • nsisUbuntu:26.10all versions · no fixed version listed
  • nsisUbuntu:26.04:LTSall versions · no fixed version listed
  • nsisUbuntu:25.10all versions · no fixed version listed
  • nsisUbuntu:24.04:LTSall versions · no fixed version listed
  • nsisUbuntu:22.04:LTSall versions · no fixed version listed
  • nsisUbuntu:20.04:LTSall versions · no fixed version listed
  • nsisUbuntu:18.04:LTSall versions · no fixed version listed

4 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Nullsoft nullsoft scriptable install system to 3.12

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2026-04-24
Last Modified
2026-10-26
NVD status
Analyzed
GitHub Advisory
GHSA-594m-24qw-wfmp

Frequently asked questions

What is 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_GetTempFileName to return 0, as shown in the references).

Is CVE-2026-42171 actively exploited?

Active exploitation of CVE-2026-42171 has not been confirmed. Its EPSS score was 0.2% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

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

CVE-2026-42171 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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Sources for this record