Vulnerability details
CVE-2026-29079
lexbor lexbor
Type Confusion in Lexbor Fragment Parser
CVSS 4.0
8.2High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.2High | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| lexbor | lexbor | < 2.7.0 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://github.com/lexbor/lexbor/security/advisories/GHSA-mrpr-v36q-2vp8 x_refsource_CONFIRM
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Details
- Published
- 2026-03-13
- Last updated
- 2026-03-16
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.3%
Probability of exploitation in 30 days
23.5%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-843Access of Resource Using Incompatible Type ('Type Confusion')