Arbitrary Argument Injection Affecting jellyfin.controller package, versions [,10.11.7)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DOTNET-JELLYFINCONTROLLER-16068346
- published15 Apr 2026
- disclosed14 Apr 2026
- creditPaul Gerste, Bas
Introduced: 14 Apr 2026
NewCVE-2026-35033 (opens in a new tab)How to fix?
Upgrade Jellyfin.Controller to version 10.11.7 or higher.
Overview
Affected versions of this package are vulnerable to Arbitrary Argument Injection via the ParseStreamOptions method. An attacker can access arbitrary files on the server and exfiltrate their contents by injecting malicious arguments into the StreamOptions query parameter, which are then concatenated into the ffmpeg command line without proper validation. This allows reading sensitive files such as /etc/shadow and returning their contents in the video stream response. This is only exploitable if an attacker can obtain a valid item GUID, which typically requires an authenticated user.