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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.

🗓️ 15 Apr 2022 07:00:00Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 1 Views

Lua 5.4.0–5.4.3 has a heap buffer over-read in singlevar due to missing luaK_exp2anyregup.

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18 Feb 2026 09:02Current
8High risk
Vulners AI Score8
CVSS 26.4
CVSS 3.19.1
EPSS0.02919
1