singlevar in lparser.c in Lua through 5.4.4 lacks a certain luaK_exp2anyregup call, leading to a heap-based buffer over-read that might affect a system that compiles untrusted Lua code.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-28805
• https://lua-users.org/lists/lua-l/2022-02/msg00001.html
• https://lua-users.org/lists/lua-l/2022-02/msg00070.html
• lua/lua@1f3c6f4
• https://lua-users.org/lists/lua-l/2022-04/msg00009.html
• https://security.gentoo.org/glsa/202305-23
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RJNJ66IFDUKWJJZXHGOLRGIA3HWWC36R
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UHYZOEFDVLVAD6EEP4CDW6DNONIVVHPA
• https://lists.fedoraproject.org/archives/list/[email protected]/message/RJNJ66IFDUKWJJZXHGOLRGIA3HWWC36R
• https://lists.fedoraproject.org/archives/list/[email protected]/message/UHYZOEFDVLVAD6EEP4CDW6DNONIVVHPA