What is the CVE-2026-40959 vulnerability?

CVE-2026-40959 is a security vulnerability discovered in Luanti's Luanti. The vulnerability has been assigned a CVSS score of 9.3 (critical severity). Any organization using this product should immediately verify their exposure and take appropriate remediation steps.

Who is affected by CVE-2026-40959?

This vulnerability affects users of Luanti's Luanti. Organizations using this solution should check whether their deployed version is vulnerable and apply available security patches or implement recommended workarounds.

How to protect against CVE-2026-40959?

Apply security patches released by Luanti or implement recommended workarounds. Regular vulnerability monitoring and prompt patch deployment are essential for effective protection against this type of threat.

What is the risk level of CVE-2026-40959?

The vulnerability has a CVSS score of 9.3 (critical severity). Successful exploitation could lead to compromise of organizational systems and data.

Security Alerts April 16, 2026

CVE-2026-40959: Luanti 5 before 5.15.2, when LuaJIT is used, allows a Lua sandbox escape via a crafted mod.

Luanti 5 before 5.15.2, when LuaJIT is used, allows a Lua sandbox escape via a crafted mod....

Marcin Godula

Summary

Parameter	Value
CVE ID	CVE-2026-40959
Alert Source	GitHub Advisory - Critical Vulnerability
CVE Publication Year	2026
Date Published	2026-04-16
Vendor	Luanti
Product	Luanti
CVSS Score	9.3 (critical)
EPSS Score	No data
CISA KEV	No
Ransomware	Not confirmed

Vulnerability Description

Luanti 5 before 5.15.2, when LuaJIT is used, allows a Lua sandbox escape via a crafted mod.

Required Actions

Apply vendor patches or mitigations as soon as available.

Who Is Affected?

This vulnerability affects Luanti by Luanti. Check if your organization uses this software and requires updates.

Sources

Need help securing your systems? nFlo team offers vulnerability management and 24/7 SOC services. Contact us.

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Summary

Vulnerability Description

Required Actions

Who Is Affected?

Sources

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Grzegorz Gnych

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