What’s Vulnerable › Vulnerabilities

CVE-2020-15945

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-07-24 · updated 2026-06-17

Description

Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.

Affected products

• Lua: from 5.3.1 before 5.4.0 — fixed in 5.4.0

How to fix

Upgrade to a fixed version: Lua 5.4.0. Check the vendor advisory for mitigations.

References

• http://lua-users.org/lists/lua-l/2020-07/msg00123.html
• https://github.com/lua/lua/commit/a2195644d89812e5b157ce7bac35543e06db05e3
• https://www.lua.org/bugs.html#5.4.0-8
• http://lua-users.org/lists/lua-l/2020-07/msg00123.html
• https://github.com/lua/lua/commit/a2195644d89812e5b157ce7bac35543e06db05e3

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