CVE-2026-48793: high-severity vulnerability in jellyfin
Jellyfin: Potential FFmpeg argument injection via unescaped subtitle file path
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 0.7%
Jellyfin is an open source self hosted media server. Prior to 10.11.10, a potential FFmpeg argument injection vulnerability exists in the subtitle conversion code path. SubtitleEncoder.ConvertTextSubtitleToSrtInternal (SubtitleEncoder.cs, line 382) interpolates the subtitle file path into FFmpeg command-line arguments without calling EncodingUtils.NormalizePath(). On Linux, filenames can contain double-quote characters, which break the argument quoting and allow injection of arbitrary FFmpeg arguments. The vulnerability is reachable without authentication via SubtitleController.GetSubtitle, which has no [Authorize] attribute. An attacker who can place a file in a Jellyfin media library directory (shared NAS, Samba share, guest upload) can achieve arbitrary file write on the server and information disclosure. This vulnerability is fixed in 10.11.10.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
jellyfin · jellyfinRelated CVEs — jellyfin
In the same product, most dangerous first.
CVE-2021-21402HIGHUnauthenticated Arbitrary File Access in JellyfinEPSS 79.3%CVE-2021-29490MEDIUMUnauthenticated GET requests through Remote Image endpointsEPSS 71.7%CVE-2023-30626HIGHJellyfin vulnerable to directory traversal and file write causing arbitrary code executionEPSS 2.0%CVE-2023-49096HIGHArgument Injection in FFmpeg codec parameters in JellyfinEPSS 1.3%CVE-2023-48702HIGHJellyfin Possible Remote Code Execution via custom FFmpeg binaryEPSS 1.2%CVE-2025-31499HIGHJellyfin Vulnerable to Argument Injection in FFmpegEPSS 0.8%