{"id":"CVE-2026-29079","aliases":["ALPINE-CVE-2026-29079","DEBIAN-CVE-2026-29079","EUVD-2026-12054","GHSA-mrpr-v36q-2vp8","UBUNTU-CVE-2026-29079"],"status":"published","title":"Type Confusion in Lexbor Fragment Parser","description":"Lexbor is a web browser engine library. Prior to 2.7.0, a type‑confusion vulnerability exists in Lexbor’s HTML fragment parser. When ns = UNDEF, a comment is created using the “unknown element” constructor. The comment’s data are written into the element’s fields via an unsafe cast, corrupting the qualified_name field. That corrupted value is later used as a pointer and dereferenced near the zero page. This vulnerability is fixed in 2.7.0.","severity":{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00305,"percentile":0.23616,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-843"],"published":"2026-03-13T17:19:46Z","modified":"2026-11-03T06:32:53Z","fixes":[{"ecosystem":"Alpine:v3.22","package":"php84","fixed_in":["8.4.27-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"php84","fixed_in":["8.4.21-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"php85","fixed_in":["8.5.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"php85","fixed_in":["8.5.6-r0"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"lexbor","fixed_in":["3.0.0-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.22","package":"php84","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.4.27-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"php84","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.4.21-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"php85","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"php85","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.6-r0"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"lexbor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.0-1"}]}],"versions":["2.6.0-1","2.6.0-2","3.0.0-1~exp1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"lexbor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.0-1","3.0.0-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"lexbor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.0-1"]}],"products":[{"vendor":"lexbor","product":"lexbor"}],"references":[{"url":"https://github.com/lexbor/lexbor/security/advisories/GHSA-mrpr-v36q-2vp8","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","report"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-29079","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29079.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29079","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-29079","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-29079","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-29079","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-29079","title":"Type Confusion in Lexbor Fragment Parser","description":"Lexbor is a web browser engine library. Prior to 2.7.0, a type‑confusion vulnerability exists in Lexbor’s HTML fragment parser. When ns = UNDEF, a comment is created using the “unknown element” constructor. The comment’s data are written into the element’s fields via an unsafe cast, corrupting the qualified_name field. That corrupted value is later used as a pointer and dereferenced near the zero page. This vulnerability is fixed in 2.7.0.","status":"published","published":"2026-03-13T17:19:46.025Z","modified":"2026-03-16T17:05:28.19Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-843"],"updated_at":"2026-11-02T14:19:56.284359Z"}],"euvd":[{"id":"EUVD-2026-12054","description":"Lexbor is a web browser engine library. Prior to 2.7.0, a type‑confusion vulnerability exists in Lexbor’s HTML fragment parser. When ns = UNDEF, a comment is created using the “unknown element” constructor. The comment’s data are written into the element’s fields via an unsafe cast, corrupting the qualified_name field. That corrupted value is later used as a pointer and dereferenced near the zero page. This vulnerability is fixed in 2.7.0.","status":"published","published":"2026-03-13T17:19:46Z","modified":"2026-03-16T17:05:28Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T19:25:34.078511Z"}],"nvd":[{"id":"CVE-2026-29079","description":"Lexbor is a web browser engine library. Prior to 2.7.0, a type‑confusion vulnerability exists in Lexbor’s HTML fragment parser. When ns = UNDEF, a comment is created using the “unknown element” constructor. The comment’s data are written into the element’s fields via an unsafe cast, corrupting the qualified_name field. That corrupted value is later used as a pointer and dereferenced near the zero page. This vulnerability is fixed in 2.7.0.","status":"published","published":"2026-03-13T19:54:32.747Z","modified":"2026-06-17T10:29:33.903Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-843"],"updated_at":"2026-11-02T14:12:09.358914Z"}],"osv":[{"id":"ALPINE-CVE-2026-29079","description":"Lexbor is a web browser engine library. Prior to 2.7.0, a type‑confusion vulnerability exists in Lexbor’s HTML fragment parser. When ns = UNDEF, a comment is created using the “unknown element” constructor. The comment’s data are written into the element’s fields via an unsafe cast, corrupting the qualified_name field. That corrupted value is later used as a pointer and dereferenced near the zero page. This vulnerability is fixed in 2.7.0.","status":"published","published":"2026-03-13T19:54:32.747Z","modified":"2026-11-03T06:32:53.779437441Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T07:16:26.770911Z"},{"id":"CVE-2026-29079","title":"Type Confusion in Lexbor Fragment Parser","description":"Lexbor is a web browser engine library. Prior to 2.7.0, a type‑confusion vulnerability exists in Lexbor’s HTML fragment parser. When ns = UNDEF, a comment is created using the “unknown element” constructor. The comment’s data are written into the element’s fields via an unsafe cast, corrupting the qualified_name field. That corrupted value is later used as a pointer and dereferenced near the zero page. This vulnerability is fixed in 2.7.0.","status":"published","published":"2026-03-13T17:19:46.025Z","modified":"2026-10-28T02:30:45.680315039Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-843"],"updated_at":"2026-11-02T15:45:00.530889Z"},{"id":"DEBIAN-CVE-2026-29079","description":"Lexbor is a web browser engine library. Prior to 2.7.0, a type‑confusion vulnerability exists in Lexbor’s HTML fragment parser. When ns = UNDEF, a comment is created using the “unknown element” constructor. The comment’s data are written into the element’s fields via an unsafe cast, corrupting the qualified_name field. That corrupted value is later used as a pointer and dereferenced near the zero page. This vulnerability is fixed in 2.7.0.","status":"published","published":"2026-03-13T19:54:32.747Z","modified":"2026-10-01T03:03:02.953066501Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:53.877573Z"},{"id":"UBUNTU-CVE-2026-29079","description":"Lexbor is a web browser engine library. Prior to 2.7.0, a type‑confusion vulnerability exists in Lexbor’s HTML fragment parser. When ns = UNDEF, a comment is created using the “unknown element” constructor. The comment’s data are written into the element’s fields via an unsafe cast, corrupting the qualified_name field. That corrupted value is later used as a pointer and dereferenced near the zero page. This vulnerability is fixed in 2.7.0.","status":"published","published":"2026-03-13T19:54:00Z","modified":"2026-10-17T12:59:57.04920697Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:11.640778Z"}]}}