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CVE-2026-50574 is a vulnerability in yt-dlp affecting versions prior to 2026.06.09 when aria2c is configured as an external downloader for fragmented manifest formats such as HLS and DASH. The flaw arises because yt-dlp passes insufficiently sanitized attacker-controlled input into an aria2c input file. yt-dlp extracts fragment URLs from manifests and writes them to an aria2c input file used with the -i option, but aria2c input files also support option-bearing configuration lines. This allows crafted manifest data or metadata to inject unintended aria2c directives. Documented attack paths include DASH fragment URLs containing HTML-escaped newline sequences that are converted into real newlines during processing, and malicious metadata fields incorporated into output templates when newline sanitization is disabled with --no-windows-filename. Successful exploitation enables arbitrary file write through injected aria2c options. On Windows, this can lead to immediate arbitrary code execution; on non-Windows platforms, it can lead to code execution on a subsequent yt-dlp invocation. The issue was fixed in yt-dlp 2026.06.09 by removing support for downloading fragmented manifest formats with aria2c.
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A vulnerability referenced in a Fedora security notice affecting the Fedora 45 yt-dlp package; the content indicates public exploit availability via the temporal metric E:P, but provides no further technical description.
A specific vulnerability referenced in a Fedora security update affecting the Fedora yt-dlp package; the content indicates exploit code is available via the temporal vector E:P, but provides no further technical details.
An arbitrary file write vulnerability in yt-dlp when using aria2c as an external downloader for fragmented manifest formats, which can result in arbitrary code execution on Windows immediately and on non-Windows systems upon the next invocation of yt-dlp.
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