UBUNTU-CVE-2026-29079

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Source
https://ubuntu.com/security/CVE-2026-29079
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29079.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-29079
Upstream
Published
2026-03-13T19:54:00Z
Modified
2026-05-20T16:24:54.501091781Z
Severity
  • 8.2 (High) CVSS_V4 - 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 CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:26.04:LTS / lexbor

Package

Name
lexbor
Purl
pkg:deb/ubuntu/lexbor?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.6.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblexbor2",
            "binary_version": "2.6.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29079.json"