CVE-2026-42171
7.8 · HIGHOverview
CVE-2026-42171 is a high-severity vulnerability affecting nullsoft nullsoft_scriptable_install_system. It was published on April 24, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical 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).
Remediation
Check the references section for vendor advisories and patches from nullsoft. Update nullsoft_scriptable_install_system to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| nullsoft | nullsoft_scriptable_install_system | >= 3.06.1, < 3.12 | Affected |
References
Frequently Asked Questions
What is CVE-2026-42171?
CVE-2026-42171 is a high-severity vulnerability affecting nullsoft nullsoft_scriptable_install_system. It was published on April 24, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).
How severe is CVE-2026-42171?
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-42171?
Check the references section for vendor advisories and patches from nullsoft. Update nullsoft_scriptable_install_system to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-42171?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-42171 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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