TI-2020-14915 Aliases CVE-2020-24371 GHSA-4m5p-2hm8-9fxm

lgc.c in Lua 5.4.0 mishandles the interaction between barriers and the sweep phase…

LOW 28CWE-763Published 2020-08-17 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · None · Low
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

lgc.c in Lua 5.4.0 mishandles the interaction between barriers and the sweep phase, leading to a memory access violation involving collectgarbage.

Why it matters now

EPSS 0.01745 77th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:lua:lua:5.4.0:-::::::	5.4.0	Vulnerable	Lua

cpe:2.3:a:lua:lua:5.4.0:-:*:*:*:*:*:* Versions 5.4.0 Vulnerable ·Lua

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 3 products

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8

Timeline

2026-10-02 Threatist record created from CVE-2020-24371
2026-10-03 Alias added: GHSA-4m5p-2hm8-9fxm

References

Exploit 1

https://www.lua.org/bugs.html#5.4.0-10

Patch 1

https://github.com/lua/lua/commit/a6da1472c0c5e05ff249325f979531ad51533110

TI-2021-20978 In Lua 5.4.3, an erroneous finalizer called during a tail call leads to a heap-based buffer over-read. CVSS 3.1HIGH 7.5
TI-2019-04752 Lua 5.3.5 has a use-after-free in lua_upvaluejoin in lapi.c. CVSS 3.1HIGH 7.5
TI-2020-12507 Lua 5.4.0 has a getobjname heap-based buffer over-read because youngcollection in lgc.c… CVSS 3.1CRITICAL 9.8
TI-2022-11427 singlevar in lparser.c in Lua from (including) 5.4.0 up to (excluding) 5.4.4 lacks a… CVSS 3.1CRITICAL 9.1
TI-2020-12506 Lua through 5.4.0 mishandles the interaction between stack resizes and garbage… CVSS 3.1HIGH 8.8
TI-2022-14562 An issue in the component luaG_runerror of Lua v5.4.4 and below leads to a heap-buffer… CVSS 3.1HIGH 7.5

See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences