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Vulnerability record · CVE-2021-44964 · published 14 March 2022

CVE-2021-44964: Lua use after free vulnerability

Lua · Lua

Use after free in garbage collector and finalizer of lgc.c in Lua interpreter 5.4.0~5.4.3 allows attackers to perform Sandbox Escape via a crafted script file.

6.3 CVSS 3.1 Medium EPSS 0.99% · top 39.1% CWE-416 · Use after free
6.3CVSS 3.1 base score, v2 4.3
0.99%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 6 tagged exploit
17 Jun 2026Last modified by NVD

Description

Use after free in garbage collector and finalizer of lgc.c in Lua interpreter 5.4.0~5.4.3 allows attackers to perform Sandbox Escape via a crafted script file.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lua-users.org/lists/lua-l/2021-11/msg00186.html ExploitMailing ListTechnical DescriptionVendor Advisory
http://lua-users.org/lists/lua-l/2021-12/msg00007.html ExploitMailing ListVendor Advisory
http://lua-users.org/lists/lua-l/2021-12/msg00015.html Mailing ListVendor Advisory
http://lua-users.org/lists/lua-l/2021-12/msg00030.html Mailing ListVendor Advisory
https://github.com/Lua-Project/lua-5.4.4-sandbox-escape-with-new-vulnerability ExploitThird Party Advisory
http://lua-users.org/lists/lua-l/2021-11/msg00186.html ExploitMailing ListTechnical DescriptionVendor Advisory
http://lua-users.org/lists/lua-l/2021-12/msg00007.html ExploitMailing ListVendor Advisory
http://lua-users.org/lists/lua-l/2021-12/msg00015.html Mailing ListVendor Advisory
http://lua-users.org/lists/lua-l/2021-12/msg00030.html Mailing ListVendor Advisory
https://github.com/Lua-Project/lua-5.4.4-sandbox-escape-with-new-vulnerability ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-15889Lua out-of-bounds read vulnerabilityLua 5.4.0 has a getobjname heap-based buffer over-read because youngcollection in lgc.c uses markold for an insufficient number of list members.EPSS 2.2%9.1CVE-2022-28805Lua out-of-bounds read vulnerabilitysinglevar 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 o…EPSS 3.0%8.8CVE-2020-15888Lua out-of-bounds read vulnerabilityLua through 5.4.0 mishandles the interaction between stack resizes and garbage collection, leading to a heap-based buffer overflow, heap-based buffer…EPSS 2.4%7.8CVE-2020-24342Lua memory buffer overflow vulnerabilityLua through 5.4.0 allows a stack redzone cross in luaO_pushvfstring because a protection mechanism wrongly calls luaD_callnoyield twice in a row.EPSS 1.1%7.5CVE-2021-45985Lua out-of-bounds write vulnerabilityIn Lua 5.4.3, an erroneous finalizer called during a tail call leads to a heap-based buffer over-read.EPSS 1.4%7.5CVE-2022-33099Lua out-of-bounds write vulnerabilityAn issue in the component luaG_runerror of Lua v5.4.4 and below leads to a heap-buffer overflow when a recursive error occurs.EPSS 2.8%7.5CVE-2020-24369Lua null pointer dereference vulnerabilityldebug.c in Lua 5.4.0 attempts to access debug information via the line hook of a stripped function, leading to a NULL pointer dereference.EPSS 1.7%7.5CVE-2019-6706Lua use after free vulnerabilityLua 5.3.5 has a use-after-free in lua_upvaluejoin in lapi.c. For example, a crash outcome might be achieved by an attacker who is able to trigger a d…EPSS 17%

Source: NIST National Vulnerability Database (record CVE-2021-44964), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.