What’s Vulnerable › Vulnerabilities

CVE-2019-6706

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 17.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-01-23 · updated 2026-06-17
• Weakness: CWE-416

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.

Affected products

• Canonical Ubuntu Linux: 16.04, 18.04, 18.10
• Lua: 5.3.5

References

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

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