mp4v2 — security advisory

{
  "id": "0559622e7356f3ec2ecda84aaf850a4e7b722e92ec8cb2ad3855a0b31704283d",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-95121",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-95121",
    "summary": "An issue in mp4v2 2.0.0 allows an attacker to execute arbitrary code via the MP4RtpAtom::ReadHntiType() in src/atom_rtp.cpp. A specially crafted MP4 file can cause an undersized rtp atom to produce a near-2^64 allocation size through an unchecked offset subtraction",
    "evidence": "osv:UBUNTU-CVE-2026-95121",
    "products": [
      {
        "name": {
          "value": "mp4v2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2.0.0~dfsg0-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.0.0~dfsg0-4",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "mp4v2",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2.0.0~dfsg0-6",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-95121",
      "aliases": [
        "UBUNTU-CVE-2026-95121"
      ],
      "metrics": [
        {
          "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"
                }
              ]
            }
          ],
          "package": {
            "name": "mp4v2",
            "purl": "pkg:deb/ubuntu/mp4v2?arch=source&distro=xenial",
            "ecosystem": "Ubuntu:16.04:LTS"
          },
          "versions": [
            "2.0.0~dfsg0-3",
            "2.0.0~dfsg0-4"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-95121.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libmp4v2-2",
                "binary_version": "2.0.0~dfsg0-4"
              },
              {
                "binary_name": "mp4v2-utils",
                "binary_version": "2.0.0~dfsg0-4"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "mp4v2",
            "purl": "pkg:deb/ubuntu/mp4v2?arch=source&distro=bionic",
            "ecosystem": "Ubuntu:18.04:LTS"
          },
          "versions": [
            "2.0.0~dfsg0-6"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-95121.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libmp4v2-2",
                "binary_version": "2.0.0~dfsg0-6"
              },
              {
                "binary_name": "mp4v2-utils",
                "binary_version": "2.0.0~dfsg0-6"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T13:01:19.352157089Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-95121"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-95121",
        "https://www.cve.org/CVERecord?id=CVE-2026-95121",
        "https://gist.github.com/1820893135-pixel/c56b6a1627453e67ca2fb7e29bae95c6",
        "https://github.com/TechSmith/mp4v2/issues/98",
        "https://github.com/TechSmith/mp4v2/pull/100",
        "https://github.com/TechSmith/mp4v2/pull/100/changes/c7f4e1da1b75996a053b05b69be8e738bf77a26c"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-95121",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 361666,
  "published_at": "2026-10-13T15:17:00+00:00"
}