USN-7694-1 (UBUNTU-CVE-2025-6021)

Vulnerability from osv_ubuntu – Published: 2025-08-14 04:48 – Updated: 2026-06-25 10:46 – Source website
VLAI
Summary
libxml2 vulnerabilities
Details

Ahmed Lekssays discovered that libxml2 did not properly perform certain mathematical operations, leading to an integer overflow. An attacker could possibly use this issue to cause a crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2025-6021)

Ahmed Lekssays discovered that libxml2 did not properly validate the size of an untrusted input stream. An attacker could possibly use this issue to cause a crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2025-6170)

Nikita Sveshnikov discovered that libxml2 did not properly handle certain XPath expressions, leading to a use-after-free vulnerability. An attacker could potentially exploit this issue to cause a denial of service. (CVE-2025-49794)

Nikita Sveshnikov discovered that libxml2 contained a type confusion vulnerability when parsing specially crafted XML documents. An attacker could potentially exploit this issue to cause a denial of service. (CVE-2025-49796)

References
To clipboard 

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            {
              "id": "CVE-2025-49796",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libxml2",
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.4"
          },
          {
            "binary_name": "libxml2-utils",
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.4"
          },
          {
            "binary_name": "python3-libxml2",
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libxml2",
        "purl": "pkg:deb/ubuntu/libxml2@2.9.14+dfsg-1.3ubuntu3.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.14+dfsg-1.3ubuntu3.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.9.14+dfsg-1.3",
        "2.9.14+dfsg-1.3build1",
        "2.9.14+dfsg-1.3build2",
        "2.9.14+dfsg-1.3build3",
        "2.9.14+dfsg-1.3ubuntu1",
        "2.9.14+dfsg-1.3ubuntu2",
        "2.9.14+dfsg-1.3ubuntu3",
        "2.9.14+dfsg-1.3ubuntu3.1",
        "2.9.14+dfsg-1.3ubuntu3.2",
        "2.9.14+dfsg-1.3ubuntu3.3"
      ]
    }
  ],
  "aliases": [],
  "details": "Ahmed Lekssays discovered that libxml2 did not properly perform certain\nmathematical operations, leading to an integer overflow. An attacker\ncould possibly use this issue to cause a crash, resulting in a denial of\nservice, or possibly execute arbitrary code. (CVE-2025-6021)\n\nAhmed Lekssays discovered that libxml2 did not properly validate the size\nof an untrusted input stream. An attacker could possibly use this issue\nto cause a crash, resulting in a denial of service, or possibly execute\narbitrary code. (CVE-2025-6170)\n\nNikita Sveshnikov discovered that libxml2 did not properly handle certain\nXPath expressions, leading to a use-after-free vulnerability. An attacker\ncould potentially exploit this issue to cause a denial of service.\n(CVE-2025-49794)\n\nNikita Sveshnikov discovered that libxml2 contained a type confusion\nvulnerability when parsing specially crafted XML documents. An attacker\ncould potentially exploit this issue to cause a denial of service.\n(CVE-2025-49796)",
  "id": "USN-7694-1",
  "modified": "2026-06-25T10:46:55Z",
  "published": "2025-08-14T04:48:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7694-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-6021"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-6170"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-49794"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-49796"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "libxml2 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2025-6021",
    "UBUNTU-CVE-2025-6170",
    "UBUNTU-CVE-2025-49794",
    "UBUNTU-CVE-2025-49796"
  ]
}



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