Read the docs
TI-2021-20350 Aliases CVE-2021-44964GHSA-rvj2-9p3c-wmwh

Use after free in garbage collector and finalizer of lgc.c in Lua interpreter 5.4.0~5.4.3…

Priority LOW 30CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.00985 62nd percentileScored 2026-11-07
Public exploit Yes 3 exploit referencesTagged by NVD
Fix Fixed Red Hat: 2 advisories

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:lua:lua:*:*:*:*:*:*:*:*5.4.0 – 5.4.3VulnerableLua
  • cpe:2.3:a:lua:lua:*:*:*:*:*:*:*:* Versions 5.4.0 – 5.4.3 Vulnerable ·Lua

Remediation

Red Hat 2 advisories

  • RHSA-2023:1211 Released 2023-03-14 · Red Hat rating Moderate
    lua security update
    • Red Hat CodeReady Linux Builder EUS (v.9.0) lua-5.4.4-1.el9_0.1, lua-devel-5.4.4-1.el9_0.1
    • Red Hat Enterprise Linux AppStream EUS (v.9.0) lua-5.4.4-1.el9_0.1
    • Red Hat Enterprise Linux BaseOS EUS (v.9.0) lua-5.4.4-1.el9_0.1, lua-libs-5.4.4-1.el9_0.1
  • RHSA-2023:0957 Released 2023-02-28 · Red Hat rating Moderate
    lua security update
    • Red Hat CodeReady Linux Builder (v. 9) lua-5.4.4-2.el9_1, lua-devel-5.4.4-2.el9_1
    • Red Hat Enterprise Linux AppStream (v. 9) lua-5.4.4-2.el9_1
    • Red Hat Enterprise Linux BaseOS (v. 9) lua-5.4.4-2.el9_1, lua-libs-5.4.4-2.el9_1

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder (v. 9)Fixed RHSA-2023:0957
Red Hat CodeReady Linux Builder EUS (v.9.0)Fixed RHSA-2023:1211
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2023:0957
Red Hat Enterprise Linux AppStream EUS (v.9.0)Fixed RHSA-2023:1211
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2023:0957
Red Hat Enterprise Linux BaseOS EUS (v.9.0)Fixed RHSA-2023:1211
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat JBoss Core Services

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-44964
  2. 2026-10-03 Alias added: GHSA-rvj2-9p3c-wmwh

References

Exploit 3

Advisory 2

  • 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