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.

PUBLISHED Reserved 2026-03-03 | Published 2026-03-13 | Updated 2026-03-13 | Assigner GitHub_M

Problem types

CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')

Product status

References

github.com/...lexbor/security/advisories/GHSA-mrpr-v36q-2vp8

cve.org (CVE-2026-29079)

nvd.nist.gov (CVE-2026-29079)

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