CVE-2025-54140 HIGH

CVE-2025-54140: pyLoad has Path Traversal Vulnerability in json/upload Endpoint that allows Arbitrary File Write

Vendor Pyload
Product pyload
Weakness CWE-22 · Path traversal
Published July 22, 2025
Last update July 23, 2025

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

What the vulnerability does

01Description

pyLoad is a free and open-source Download Manager written in pure Python. In version 0.5.0b3.dev89, an authenticated path traversal vulnerability exists in the /json/upload endpoint of pyLoad. By manipulating the filename of an uploaded file, an attacker can traverse out of the intended upload directory, allowing them to write arbitrary files to any location on the system accessible to the pyLoad process. This may lead to: Remote Code Execution (RCE), local privilege escalation, system-wide compromise, persistence, and backdoors. This is fixed in version 0.5.0b3.dev90.

Key dates

02Disclosure timeline

July 22, 2025 CVE published
July 23, 2025 Record updated