{"id":"CVE-2019-6706","details":"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.","modified":"2026-07-08T20:57:32.268098Z","published":"2019-01-23T19:29:00.447Z","related":["ALSA-2019:3706","CGA-p894-q47q-gr8g","SUSE-SU-2019:0247-1","openSUSE-SU-2019:0175-1"],"database_specific":{"unresolved_ranges":[{"vendor_product":"canonical:ubuntu_linux","cpes":["cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*","cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*","cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"16.04"},{"last_affected":"16.04"},{"introduced":"18.04"},{"last_affected":"18.04"},{"introduced":"18.10"},{"last_affected":"18.10"}],"source":"CPE_STRING"}]},"references":[{"type":"WEB","url":"http://lua-users.org/lists/lua-l/2019-01/msg00039.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/06/msg00031.html"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/cve-2019-6706"},{"type":"FIX","url":"https://github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71e"},{"type":"EVIDENCE","url":"http://packetstormsecurity.com/files/151335/Lua-5.3.5-Use-After-Free.html"},{"type":"EVIDENCE","url":"https://github.com/Lua-Project/cve-analysis/blob/a43c9ccd00274b31fa2f24c6c8f20ce36655682d/CVE-2019-6706.pdf"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/lua/lua","events":[{"introduced":"063d4e4543088e7a21965bda8ee5a0f952a9029e"},{"last_affected":"063d4e4543088e7a21965bda8ee5a0f952a9029e"},{"fixed":"89aee84cbc9224f638f3b7951b306d2ee8ecb71e"}],"database_specific":{"source":["CPE_STRING","REFERENCES"],"cpe":"cpe:2.3:a:lua:lua:5.3.5:*:*:*:*:*:*:*","extracted_events":[{"introduced":"5.3.5"},{"last_affected":"5.3.5"}]}}],"versions":["5.3.5","v5.3.5"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-6706.json","vanir_signatures_modified":"2026-07-08T20:57:32Z","vanir_signatures":[{"signature_type":"Function","signature_version":"v1","source":"https://github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71e","target":{"file":"lapi.c","function":"getupvalref"},"deprecated":false,"digest":{"function_hash":"45231132265163223636532311818292060392","length":408},"id":"CVE-2019-6706-00032def"},{"signature_version":"v1","source":"https://github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71e","target":{"file":"lapi.c","function":"lua_upvalueid"},"deprecated":false,"digest":{"length":468,"function_hash":"168654682806415888564868502854858233475"},"id":"CVE-2019-6706-264b1e53","signature_type":"Function"},{"signature_type":"Function","signature_version":"v1","source":"https://github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71e","target":{"file":"lapi.c","function":"lua_upvaluejoin"},"deprecated":false,"digest":{"function_hash":"336886739732523367635662810366732805781","length":392},"id":"CVE-2019-6706-ad2906b9"},{"deprecated":false,"digest":{"line_hashes":["114280754343182667492310544413047257523","135797660772714151558304634952356559189","324426448145863171687706490342891370242","158464887736040735811625781411603539517","109284068507191940525491597714252165763","17353900652863108361291584574332551664","73243341667893678318317837601477420919","184943886777344493192408412618803260479","92936929984927184471054474271540256660","315317082330350668532734840438847734449","232247388784538711332203219499193690964","238016185841859018970600644226169544163","212682399206584147756393191489144751679","265234325060766264020411529438170302368","316472907546906173177633520659052112636","211225411100249201500195271735977703457","105626001136622936431389132883094094572","215722041084154120534485317323045511353","69590894200313878133321429160581940638","104367335793266688094676634691058216743"],"threshold":0.9},"id":"CVE-2019-6706-e7916afb","signature_type":"Line","signature_version":"v1","source":"https://github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71e","target":{"file":"lapi.c"}}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}