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.
History

Wed, 18 Mar 2026 20:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:lexbor:lexbor:*:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Mon, 16 Mar 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 16 Mar 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Lexbor
Lexbor lexbor
Vendors & Products Lexbor
Lexbor lexbor

Fri, 13 Mar 2026 17:30:00 +0000

Type Values Removed Values Added
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.
Title Type Confusion in Lexbor Fragment Parser
Weaknesses CWE-843
References
Metrics cvssV4_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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-03-13T17:19:46.025Z

Updated: 2026-03-16T17:05:28.190Z

Reserved: 2026-03-03T20:51:43.483Z

Link: CVE-2026-29079

cve-icon Vulnrichment

Updated: 2026-03-16T17:05:24.686Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-13T19:54:32.747

Modified: 2026-03-18T20:20:53.060

Link: CVE-2026-29079

cve-icon Redhat

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