EUVD-2026-12054CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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3Description
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.
Analysis
Denial of service in Lexbor prior to version 2.7.0 results from a type-confusion vulnerability in the HTML fragment parser that corrupts memory and causes a null pointer dereference. An unauthenticated remote attacker can exploit this by sending malformed HTML to crash applications using the vulnerable Lexbor library. …
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Remediation
Within 24 hours: Identify all systems and applications using Lexbor library and document their version numbers and deployment scope. Within 7 days: Implement network segmentation to isolate affected systems, disable HTML fragment parsing functionality if operationally feasible, and establish enhanced monitoring for exploitation attempts. …
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