Use After Free in Lua
CVE-2019-6706
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.
Vulnerability class: Use-After-Free
EPSS: 0.172 (96.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Lua — versions 5.3.5
- Canonical Ubuntu_linux — versions 16.04, 18.04, 18.10
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Exploit, VDB Entry, Third Party Advisory)
- cve@mitre.org (Exploit, Third Party Advisory)
- cve@mitre.org (Patch, Third Party Advisory)
- cve@mitre.org (Broken Link)
- cve@mitre.org (Third Party Advisory)
- cve@mitre.org (mailing-list)
Frequently asked questions
- What is CVE-2019-6706?
- CVE-2019-6706 is a high-severity vulnerability in Lua, classified under Use After Free. CVSS score: 7.5/10. Published 2019-01-23.
- How severe is CVE-2019-6706?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2019-6706 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.