RCE in Bluegrams Youtubedlsharp
CVE-2025-43858
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.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.003 (16.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.2 (Critical). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L.
Affected products
- Bluegrams Youtubedlsharp — versions >= 1.0.0-beta4, < 1.1.2
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-43858?
- CVE-2025-43858 is a critical-severity vulnerability in Bluegrams Youtubedlsharp, classified under Command Injection. CVSS score: 9.2/10. Published 2025-04-24.
- How severe is CVE-2025-43858?
- Critical severity. CVSS v3 base score is 9.2 out of 10.