singlevar in lparser.c in Lua from (including) 5.4.0 up to (excluding) 5.4.4 lacks a certain luaK_exp2anyregup call, leading to a heap-based buffer over-read that might affect a system that compiles untrusted Lua code. A heap buffer-overflow vulnerability was found in Lua. The flaw occurs due to vulnerable code present in the lparser.c function of Lua that allows the execution of untrusted Lua code into a system, resulting in malicious activity.
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