CVE-2026-35031 Jellyfin: Potential RCE via subtitle upload path traversal + .strm chain

Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain a vulnerability chain in the subtitle upload endpoint POST /Videos/itemId/Subtitles, where the Format field is not validated, allowing path traversal via the file extension and enabling arbitrary file write. Th...