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CVE-2025-43858

YoutubeDLSharp allows command injection on windows system due to non sanitized arguments

CVSS 3.1 9.2 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2025-43858

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2025-43858

Published

YoutubeDLSharp

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Bluegrams",
                    "product": "YoutubeDLSharp",
                    "versions": [
                        {
                            "version": ">= 1.0.0-beta4, < 1.1.2",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON