What’s Vulnerable › Vulnerabilities

CVE-2022-28805

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-04-08 · updated 2026-06-17
• Weakness: CWE-125

Description

singlevar in lparser.c in Lua from (including) 5.4.0 up to (excluding) 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.

Affected products

• Fedoraproject Fedora: 35, 36
• Lua: from 5.4.0 before 5.4.5 — fixed in 5.4.5

How to fix

Upgrade to a fixed version: Lua 5.4.5. Check the vendor advisory for mitigations.

References

• https://github.com/lua/lua/commit/1f3c6f4534c6411313361697d98d1145a1f030fa
• 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://lua-users.org/lists/lua-l/2022-02/msg00001.html
• https://lua-users.org/lists/lua-l/2022-02/msg00070.html
• https://lua-users.org/lists/lua-l/2022-04/msg00009.html
• https://security.gentoo.org/glsa/202305-23
• https://github.com/lua/lua/commit/1f3c6f4534c6411313361697d98d1145a1f030fa
• 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://lua-users.org/lists/lua-l/2022-02/msg00001.html
• https://lua-users.org/lists/lua-l/2022-02/msg00070.html

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