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Lexbor CVE-2026-29079

| EUVD-2026-12054 HIGH
Access of Resource Using Incompatible Type (Type Confusion) (CWE-843)
2026-03-13 GitHub_M
Information Disclosure Memory Corruption Lexbor
7.5
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

6
Analysis Updated
Apr 16, 2026 - 06:22 EUVD-patch-fix
executive_summary
Re-analysis Queued
Apr 16, 2026 - 05:29 backfill_euvd_patch
patch_released
Patch available
Apr 16, 2026 - 05:29 EUVD
2.7.0
EUVD ID Assigned
Mar 13, 2026 - 18:00 euvd
EUVD-2026-12054
Analysis Generated
Mar 13, 2026 - 18:00 vuln.today
CVE Published
Mar 13, 2026 - 17:19 nvd
HIGH 7.5

DescriptionNVD

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.

AnalysisAI

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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RemediationAI

Within 24 hours: Identify all applications and services using Lexbor and document current versions in use. Within 7 days: Upgrade Lexbor to version 2.7.0 or later across all development, staging, and production environments; test thoroughly before production deployment. …

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CVE-2026-29079 vulnerability details – vuln.today
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