lexbor — security advisory

{
  "id": "6c946e2f9d7c47f457f165de16082124f21b535daac165d428db4f75b0cc5593",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-29079",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-29079",
    "summary": "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.",
    "evidence": "osv:UBUNTU-CVE-2026-29079",
    "products": [
      {
        "name": {
          "value": "lexbor",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2.6.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.0.0-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "lexbor",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2.6.0-1",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-29079",
      "aliases": [
        "UBUNTU-CVE-2026-29079"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        },
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "lexbor",
            "purl": "pkg:deb/ubuntu/lexbor?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "2.6.0-1",
            "3.0.0-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29079.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "liblexbor3",
                "binary_version": "3.0.0-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "lexbor",
            "purl": "pkg:deb/ubuntu/lexbor?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "2.6.0-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29079.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "liblexbor2",
                "binary_version": "2.6.0-1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T12:59:57.049206970Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-29079"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-29079",
        "https://www.cve.org/CVERecord?id=CVE-2026-29079",
        "https://github.com/lexbor/lexbor/security/advisories/GHSA-mrpr-v36q-2vp8"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-29079",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 360026,
  "published_at": "2026-03-13T19:54:00+00:00"
}