libxml2 — security advisory

{
  "id": "a210726ddb2c1a0fdbad5f1a79851398e46f9080a98dd2c244c16dc0a783ef1b",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-86139",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-86139",
    "summary": "In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.",
    "evidence": "osv:UBUNTU-CVE-2026-86139",
    "products": [
      {
        "name": {
          "value": "libxml2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.15.2+dfsg-0.1ubuntu0.3",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "2.14.5+dfsg-0.2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.14.5+dfsg-0.2build1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.15.1+dfsg-0.3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.15.1+dfsg-0.4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.15.1+dfsg-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.15.1+dfsg-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.15.1+dfsg-2ubuntu1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.15.1+dfsg-2ubuntu2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.15.2+dfsg-0.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.15.2+dfsg-0.1ubuntu0.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.15.2+dfsg-0.1ubuntu0.2",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-86139",
      "aliases": [
        "UBUNTU-CVE-2026-86139"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"
        },
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.15.2+dfsg-0.1ubuntu0.3"
                }
              ]
            }
          ],
          "package": {
            "name": "libxml2",
            "purl": "pkg:deb/ubuntu/libxml2?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "2.14.5+dfsg-0.2",
            "2.14.5+dfsg-0.2build1",
            "2.15.1+dfsg-0.3",
            "2.15.1+dfsg-0.4",
            "2.15.1+dfsg-1",
            "2.15.1+dfsg-2",
            "2.15.1+dfsg-2ubuntu1",
            "2.15.1+dfsg-2ubuntu2",
            "2.15.2+dfsg-0.1",
            "2.15.2+dfsg-0.1ubuntu0.1",
            "2.15.2+dfsg-0.1ubuntu0.2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86139.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libxml2-16",
                "binary_version": "2.15.2+dfsg-0.1ubuntu0.3"
              },
              {
                "binary_name": "libxml2-source",
                "binary_version": "2.15.2+dfsg-0.1ubuntu0.3"
              },
              {
                "binary_name": "libxml2-utils",
                "binary_version": "2.15.2+dfsg-0.1ubuntu0.3"
              },
              {
                "binary_name": "python3-libxml2",
                "binary_version": "2.15.2+dfsg-0.1ubuntu0.3"
              }
            ],
            "availability": "No subscription required"
          }
        }
      ],
      "modified": "2026-10-09T07:45:02.903457059Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-86139"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-86139",
        "https://www.cve.org/CVERecord?id=CVE-2026-86139",
        "https://ubuntu.com/security/notices/USN-8910-1"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-86139",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/1/score"
  },
  "source_id": "core-osv",
  "document_id": 108946,
  "published_at": "2026-09-05T05:17:00+00:00"
}