HIGH 7.5 Microsoft
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.
Microsoft Security Update 2026-Aug: 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
- cm1 lua 5.3.5-8 on CBL Mariner 1.0
- cbl2 lua 5.3.5-11 on CBL Mariner 2.0
- azl3 lua 5.4.6-1 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-6706
- https://nvd.nist.gov/vuln/detail/CVE-2019-6706
This high severity vulnerability with a CVSS score of 7.5 was published on 2026-08-06 via Microsoft. EPSS score: 17.2% (top 3% of all CVEs by exploitation probability). Affected: cm1 lua 5.3.5-8 on CBL Mariner 1.0, cbl2 lua 5.3.5-11 on CBL Mariner 2.0, azl3 lua 5.4.6-1 on Azure Linux 3.0.
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