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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

Quick assessment

Affected
SANKO Net::BitTorrent
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Sanko Robinson Net::BitTorrent是Sanko Robinson个人开发者的一个基于现代 Perl（v5.40+）从头重写的高性能 BitTorrent 客户端库，支持 BitTorrent v2、DHT、协议加密等完整功能，且可与任意事件循环集成。 Sanko Robinson Net::BitTorrent 2.0.1及之前版本存在路径遍历漏洞，该漏洞源于对对等体提供的元数据缺乏路径验证，导致路径遍历，可能允许攻击者将文件写入下载目录之外。

AI Predicted 8.1 Difficulty: Easy EPSS 0.40% · P33

Affected Version Matrix 1

VendorProduct Version RangeStatus
SANKO Net::BitTorrent < 2.1.0 affected
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I. Basic Information for CVE-2026-57079

Vulnerability Information
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Vulnerability Title
Net::BitTorrent versions before 2.1.0 for Perl write files outside the download directory via path traversal in peer-supplied metadata
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Sanko Robinson Net::BitTorrent 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sanko Robinson Net::BitTorrent是Sanko Robinson个人开发者的一个基于现代 Perl（v5.40+）从头重写的高性能 BitTorrent 客户端库，支持 BitTorrent v2、DHT、协议加密等完整功能，且可与任意事件循环集成。 Sanko Robinson Net::BitTorrent 2.0.1及之前版本存在路径遍历漏洞，该漏洞源于对对等体提供的元数据缺乏路径验证，导致路径遍历，可能允许攻击者将文件写入下载目录之外。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
SANKO Net::BitTorrent 0 ~ 2.1.0 -

II. Public POCs for CVE-2026-57079

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III. Intelligence Information for CVE-2026-57079

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Vendor Advisories for CVE-2026-57079 (1)

Other References for CVE-2026-57079 (1)

Same Patch Batch · SANKO · 2026-06-30 · 4 CVEs total

CVE-2026-57081 Net::BitTorrent versions through 2.1.0 for Perl allow remote memory exhaustion via deeply
CVE-2026-57082 Net::BitTorrent versions before 2.1.0 for Perl generate the MSE Diffie-Hellman private key
CVE-2026-57080 Net::BitTorrent versions through 2.1.0 for Perl allow remote memory exhaustion via an unca

IV. Related Vulnerabilities

Same product: Net::BitTorrent
Same vendor: SANKO
Same weakness: CWE-22