CVE-2025-43858: Bluegrams Youtubedlsharp

Critical severity, CVSS 9.2. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Bluegrams Youtubedlsharp: from 1.0.0-beta4, before 1.1.2 (fixed in 1.1.2)

Published 2025-04-24. Last modified 2026-06-17.