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Vulnerability record · CVE-2019-6706 · published 23 January 2019

CVE-2019-6706: Lua use after free vulnerability

Lua · Lua

Lua 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 debug.upvaluejoin call in which the arguments have certain relationships.

7.5 CVSS 3.1 High EPSS 17% · top 3.0% CWE-416 · Use after free
7.5CVSS 3.1 base score, v2 5.0
17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

Lua 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 debug.upvaluejoin call in which the arguments have certain relationships.

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

Affected products

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

References

LinkTags
http://lua-users.org/lists/lua-l/2019-01/msg00039.html Broken Link
http://packetstormsecurity.com/files/151335/Lua-5.3.5-Use-After-Free.html ExploitThird Party AdvisoryVDB Entry
https://access.redhat.com/security/cve/cve-2019-6706 Third Party Advisory
https://github.com/Lua-Project/cve-analysis/blob/a43c9ccd00274b31fa2f24c6c8f20ce36655682d/CVE-2019-6706.pdf ExploitThird Party Advisory
https://github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71e PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/06/msg00031.html
http://lua-users.org/lists/lua-l/2019-01/msg00039.html Broken Link
http://packetstormsecurity.com/files/151335/Lua-5.3.5-Use-After-Free.html ExploitThird Party AdvisoryVDB Entry
https://access.redhat.com/security/cve/cve-2019-6706 Third Party Advisory
https://github.com/Lua-Project/cve-analysis/blob/a43c9ccd00274b31fa2f24c6c8f20ce36655682d/CVE-2019-6706.pdf ExploitThird Party Advisory
https://github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71e PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/06/msg00031.html

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Source: NIST National Vulnerability Database (record CVE-2019-6706), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.