DEBIAN-CVE-2026-103680

{
  "id": "959d94e8fdab0a895edbc3d9ab9824ec64ff104554fbd80cec19328d9ff3bb14",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-103680",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-103680",
    "summary": "A flaw was found in tnef. A heap-based buffer overflow can occur in the find_free_number() function when generating numbered backup suffixes for duplicate filenames. When numbered backups are enabled and file overwriting is disabled, an attacker can supply a specially crafted Transport Neutral Encapsulation Format (TNEF) file with an excessive number of colliding attachment filenames, causing the numeric counter to write past the allocated memory buffer. This issue may result in an application crash, leading to a Denial of Service (DoS), or potentially arbitrary code execution.",
    "evidence": "osv:DEBIAN-CVE-2026-103680",
    "products": [
      {
        "name": {
          "value": "tnef",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.4.18-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.4.18-4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.4.18-5",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.4.18-6",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "tnef",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.4.18-4",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.4.18-5",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.4.18-6",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "tnef",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.4.18-4",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.4.18-5",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1.4.18-6",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2026-103680",
      "aliases": [
        "DEBIAN-CVE-2026-103680"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "tnef",
            "purl": "pkg:deb/debian/tnef?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
            "1.4.18-3",
            "1.4.18-4",
            "1.4.18-5",
            "1.4.18-6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-103680.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "tnef",
            "purl": "pkg:deb/debian/tnef?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "1.4.18-4",
            "1.4.18-5",
            "1.4.18-6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-103680.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "tnef",
            "purl": "pkg:deb/debian/tnef?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "1.4.18-4",
            "1.4.18-5",
            "1.4.18-6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-103680.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        }
      ],
      "modified": "2026-10-06T10:00:24.346691715Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-103680"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-103680"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-103680",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 88513,
  "published_at": "2026-10-01T12:17:15.81+00:00"
}