CVE-2026-55404: yt-dlp: Downstream command injection via improper sanitization of yt-dlp --write-link output

If the --write-link, --write-url-link or --write-desktop-link options are used with yt-dlp, it may produce output that can lead to downstream remote code execution. An attacker can craft a malicious metadata payload to achieve arbitrary command injection in the .url and .desktop shortcut files written by yt-dlp. This allows for malicious shell commands or malicious remote executables to run on the user’s system if the user executes the generated .url or .desktop files.