What is CVE-2026-40959?

CVE-2026-40959 is a critical-severity vulnerability in Luanti, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 9.3/10. Published 2026-04-16.

How severe is CVE-2026-40959?

Critical severity. CVSS v3 base score is 9.3 out of 10.

Vulnerability in Luanti

CVE-2026-40959

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

EPSS: 0.000 (0.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Luanti — versions 5.0.0

Weakness classification (CWE)

CWE-829 — Inclusion of Functionality from Untrusted Control Sphere

References

cve@mitre.org
cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2026-40959?: CVE-2026-40959 is a critical-severity vulnerability in Luanti, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 9.3/10. Published 2026-04-16.
How severe is CVE-2026-40959?: Critical severity. CVSS v3 base score is 9.3 out of 10.