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5.3
MEDIUM CVSS 3.1
CVE-2026-57079
Net::BitTorrent versions before 2.1.0 for Perl write files outside the download directory via path traversal in peer-supplied metadata
Overview
Description

Net::BitTorrent versions before 2.1.0 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.

Details
INFO

Published Date :

June 30, 2026, 12:16 p.m.

Last Modified :

July 20, 2026, 7:16 a.m.

Remotely Exploit :

Yes !

Source :

9b29abf9-4ab0-4765-b253-1875cd9b441e
Impact
Affected Products

The following products are affected by CVE-2026-57079 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

No affected product recoded yet

: Total Affected Vendor : 0 | Products : 0
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 MEDIUM 134c704f-9b21-4f2e-91b3-4a467353bcc0
Solution
Update Net::BitTorrent to fix path traversal vulnerability via peer-supplied metadata.
  • Update Net::BitTorrent to a version later than 2.0.1.
  • Validate all file paths from external sources.
  • Sanitize file names for directory traversal.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-57079.

URL Resource
https://github.com/sanko/Net-BitTorrent.pm/security/advisories/GHSA-5wc6-r65f-62rr
https://metacpan.org/release/SANKO/Net-BitTorrent-v2.1.0/changes
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-57079 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-57079 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-57079 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-57079 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 9b29abf9-4ab0-4765-b253-1875cd9b441e

    Jul. 20, 2026

    Action Type Old Value New Value
    Changed Affected [{'repo': 'https://github.com/sanko/Net-BitTorrent.pm', 'vendor': 'SANKO', 'product': 'Net::BitTorrent', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '2.0.1'}], 'packageName': 'Net-BitTorrent', 'programFiles': ['lib/Net/BitTorrent/Torrent.pm', 'lib/Net/BitTorrent/Storage.pm', 'lib/Net/BitTorrent/Storage/File.pm'], 'collectionURL': 'https://cpan.org/modules', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': 'Net::BitTorrent::Torrent::_on_metadata_received'}, {'name': 'Net::BitTorrent::Storage::add_file'}, {'name': 'Net::BitTorrent::Storage::_parse_file_tree'}]}] [{'repo': 'https://github.com/sanko/Net-BitTorrent.pm', 'vendor': 'SANKO', 'product': 'Net::BitTorrent', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.1.0', 'versionType': 'custom'}], 'packageName': 'Net-BitTorrent', 'programFiles': ['lib/Net/BitTorrent/Torrent.pm', 'lib/Net/BitTorrent/Storage.pm', 'lib/Net/BitTorrent/Storage/File.pm'], 'collectionURL': 'https://cpan.org/modules', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': 'Net::BitTorrent::Torrent::_on_metadata_received'}, {'name': 'Net::BitTorrent::Storage::add_file'}, {'name': 'Net::BitTorrent::Storage::_parse_file_tree'}]}]
    Changed Description 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. Net::BitTorrent versions before 2.1.0 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.
    Added Reference https://metacpan.org/release/SANKO/Net-BitTorrent-v2.1.0/changes
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Jun. 30, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    Added SSVC {'id': 'CVE-2026-57079', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-30T13:52:00.535187Z'}
  • New CVE Received by 9b29abf9-4ab0-4765-b253-1875cd9b441e

    Jun. 30, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://github.com/sanko/Net-BitTorrent.pm', 'vendor': 'SANKO', 'product': 'Net::BitTorrent', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '2.0.1'}], 'packageName': 'Net-BitTorrent', 'programFiles': ['lib/Net/BitTorrent/Torrent.pm', 'lib/Net/BitTorrent/Storage.pm', 'lib/Net/BitTorrent/Storage/File.pm'], 'collectionURL': 'https://cpan.org/modules', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': 'Net::BitTorrent::Torrent::_on_metadata_received'}, {'name': 'Net::BitTorrent::Storage::add_file'}, {'name': 'Net::BitTorrent::Storage::_parse_file_tree'}]}]
    Added Description 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.
    Added CWE CWE-22
    Added Reference https://github.com/sanko/Net-BitTorrent.pm/security/advisories/GHSA-5wc6-r65f-62rr
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 5.3
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact