CVE-2026-29079Type Confusion in Lexbor Fragment Parser
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.2 HIGH (v4.0, CNA)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
- Weakness (CWE)
- CWE-843
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Mar 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
lexbor lexbor lexbor:lexbor (from the name) | before 2.7.0 | CNA record |
lexbor lexbor lexbor:lexbor | before 2.7.0 | NVD |
References
- https://github.com/lexbor/lexbor/security/advisories/GHSA-mrpr-v36q-2vp8x-refsource-confirm, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.