YoutubeDLSharp — Vulnerability (CVE-2025-43858)
Date: 2025-04
Attack vector: command-injection
Category: vulnerability-disclosure
Severity: Critical
CVE: CVE-2025-43858
CWE: CWE-77
CWE-78
CVSS: 9.2 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L)

YoutubeDLSharp is a wrapper for the command-line video downloaders youtube-dl and yt-dlp. In versions starting from 1.0.0-beta4 and prior to 1.1.2, an unsafe conversion of arguments allows the injection of a malicious commands when starting `yt-dlp` from a commands prompt running on Windows OS with the `UseWindowsEncodingWorkaround` value defined to true (default behavior). If a user is using built-in methods from the YoutubeDL.cs file, the value is true by default and a user cannot disable it from these methods. This issue has been patched in version 1.1.2.


Mitigations:

Architectural layers (MAESTRO):