CVE-2026-49246 Jellyfin: Potential MKV attachment filename path traversal to RCE

Jellyfin is an open source self hosted media server. Prior to 10.11.10, a specifically crafted MKV file containing forged filename tags can be leveraged to exploit missing path sanitization during playback. Jellyfin treats the MKV file name tag on MKV attachments as trusted and passes it...

CVE-2026-49246

Summary: Jellyfin is vulnerable to a path traversal leading to remote code execution via crafted MKV attachment filename tags. The issue stems from unsanitized input being passed to Path.Combine(attachmentFolder, fileName) in PathManager.GetAttachmentPath, where Path.Combine does not normalise or...