{
   "document": {
      "category": "csaf_security_advisory",
      "csaf_version": "2.0",
      "distribution": {
         "tlp": {
            "label": "WHITE",
            "url": "https://www.first.org/tlp/"
         }
      },
      "lang": "en",
      "notes": [
         {
            "category": "description",
            "text": "Net::BitTorrent versions through 2.0.1 for Perl write files outside the download directory via path traversal in peer-supplied metadata.  Net::BitTorrent validates file path components only on the .torrent-file ingest path. The peer and magnet metadata path (_on_metadata_received, reached from the BEP09 ut_metadata extension) passes attacker-supplied file names straight to Storage::add_file and Storage::_parse_file_tree, where Path::Tiny's child() does not collapse \"..\". A v2 file tree key, a v1 files[].path element, or a single-file name containing \"..\" segments therefore resolves outside the download directory.  Because the peer also controls the piece hashes and the served bytes, content verification passes, so a malicious magnet or peer writes attacker-chosen content to an attacker-chosen path on the downloading host.",
            "title": "Vulnerability Description"
         }
      ],
      "publisher": {
         "category": "other",
         "contact_details": "gdt@cpan.org",
         "name": "giterlizzi",
         "namespace": "https://github.com/giterlizzi/"
      },
      "references": [
         {
            "category": "self",
            "summary": "CPANSA-Net-BitTorrent-2026-57079 JSON",
            "url": "https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-net-bittorrent-2026-57079.json"
         },
         {
            "category": "external",
            "summary": "https://github.com/sanko/Net-BitTorrent.pm/security/advisories/GHSA-5wc6-r65f-62rr",
            "url": "https://github.com/sanko/Net-BitTorrent.pm/security/advisories/GHSA-5wc6-r65f-62rr"
         },
         {
            "category": "external",
            "summary": "CVE-2026-57079 (NVD)",
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-57079"
         }
      ],
      "title": "Net-BitTorrent vulnerability",
      "tracking": {
         "current_release_date": "2026-06-30T00:00:00",
         "generator": {
            "engine": {
               "name": "CSAF Perl Toolkit",
               "version": "0.26"
            }
         },
         "id": "CPANSA-Net-BitTorrent-2026-57079",
         "initial_release_date": "2026-06-30T00:00:00",
         "revision_history": [
            {
               "date": "2026-06-30T00:00:00",
               "number": "1",
               "summary": "First release"
            }
         ],
         "status": "final",
         "version": "1"
      }
   },
   "product_tree": {
      "branches": [
         {
            "branches": [
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/>0",
                  "product": {
                     "name": "Net-BitTorrent greater than 0",
                     "product_id": "CSAFPID-0001",
                     "product_identification_helper": {
                        "purl": "pkg:cpan/Net-BitTorrent"
                     }
                  }
               }
            ],
            "category": "product_name",
            "name": "Net-BitTorrent"
         }
      ]
   },
   "vulnerabilities": [
      {
         "cve": "CVE-2026-57079",
         "cwe": {
            "id": "CWE-22",
            "name": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"
         },
         "notes": [
            {
               "category": "description",
               "text": "Net::BitTorrent versions through 2.0.1 for Perl write files outside the download directory via path traversal in peer-supplied metadata.\n\nNet::BitTorrent validates file path components only on the .torrent-file ingest path. The peer and magnet metadata path (_on_metadata_received, reached from the BEP09 ut_metadata extension) passes attacker-supplied file names straight to Storage::add_file and Storage::_parse_file_tree, where Path::Tiny's child() does not collapse \"..\". A v2 file tree key, a v1 files[].path element, or a single-file name containing \"..\" segments therefore resolves outside the download directory.\n\nBecause the peer also controls the piece hashes and the served bytes, content verification passes, so a malicious magnet or peer writes attacker-chosen content to an attacker-chosen path on the downloading host.",
               "title": "Vulnerability Description"
            }
         ],
         "product_status": {
            "known_affected": [
               "CSAFPID-0001"
            ]
         },
         "scores": [
            {
               "cvss_v3": {
                  "baseScore": 5.3,
                  "baseSeverity": "MEDIUM",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                  "version": "3.1"
               },
               "products": [
                  "CSAFPID-0001"
               ]
            }
         ]
      }
   ]
}