High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-6706
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:36 UTC · Revision 1
Source evidence
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.
osv:CVE-2019-6706
Complete source record
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"id": "9ec2498b7c35d0192dc74cd6f52d725f259b306961ec7f584facfd5ca70bf928",
"url": "https://osv.dev/vulnerability/CVE-2019-6706",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-6706",
"summary": "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.",
"evidence": "osv:CVE-2019-6706",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2019-6706",
"aliases": [
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],
"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
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"affected": [
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{
"fixed": "89aee84cbc9224f638f3b7951b306d2ee8ecb71e"
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{
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"source": "REFERENCES_COMMIT"
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"versions": [
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"function": "getupvalref"
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"function": "lua_upvalueid"
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"function": "lua_upvaluejoin"
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"modified": "2026-10-20T13:57:28.761978225Z",
"provider": "osv",
"references": [
"https://lists.debian.org/debian-lts-announce/2023/06/msg00031.html",
"https://access.redhat.com/security/cve/cve-2019-6706",
"https://github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71e",
"https://github.com/Lua-Project/cve-analysis/blob/a43c9ccd00274b31fa2f24c6c8f20ce36655682d/CVE-2019-6706.pdf"
],
"provider_metadata": {
"unresolved_ranges": [
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"cpes": [
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"related_cves": [
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"evidence": "/id"
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"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388455,
"published_at": "2019-01-23T19:29:00.447+00:00"
}