CVE-2019-6706

Name: CVE-2019-6706
Creator: NVD / NIST
Published: 2019-01-23T19:29:00.447+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 17.22%

Last modified Jun 17, 2026

CVE-2019-6706 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 17.22% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

17.22%

96.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Lua	Lua	5.3.5
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	18.10

References

http://lua-users.org/lists/lua-l/2019-01/msg00039.htmlBroken Link
http://packetstormsecurity.com/files/151335/Lua-5.3.5-Use-After-Free.htmlExploit, Third Party Advisory, VDB Entry
https://access.redhat.com/security/cve/cve-2019-6706Third Party Advisory
https://github.com/Lua-Project/cve-analysis/blob/a43c9ccd00274b31fa2f24c6c8f20ce36655682d/CVE-2019-6706.pdfExploit, Third Party Advisory
https://github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71ePatch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/06/msg00031.html
http://lua-users.org/lists/lua-l/2019-01/msg00039.htmlBroken Link
http://packetstormsecurity.com/files/151335/Lua-5.3.5-Use-After-Free.htmlExploit, Third Party Advisory, VDB Entry
https://access.redhat.com/security/cve/cve-2019-6706Third Party Advisory
https://github.com/Lua-Project/cve-analysis/blob/a43c9ccd00274b31fa2f24c6c8f20ce36655682d/CVE-2019-6706.pdfExploit, Third Party Advisory
https://github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71ePatch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/06/msg00031.html

Timeline

Published: Jan 23, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-6706?

How severe is CVE-2019-6706?

CVE-2019-6706 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 17.22% probability of exploitation in the next 30 days.

How do I fix CVE-2019-6706?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-6706?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST