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High severity7.5NVD Advisory· Published Mar 13, 2026· Updated Jun 17, 2026

CVE-2026-29079

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.

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Affected products

3
  • Lexbor/Lexbor3 versions
    cpe:2.3:a:lexbor:lexbor:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:a:lexbor:lexbor:*:*:*:*:*:*:*:*range: <2.7.0
    • (no CPE)range: <2.7.0
    • (no CPE)range: < 2.7.0

Patches

Vulnerability mechanics

References

1

News mentions

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