Jellyfin up to 10.10.6 FFmpeg /Videos//stream argument injection

Summaryinfo

A vulnerability classified as critical has been found in Jellyfin up to 10.10.6. Affected is an unknown function of the file /Videos//stream of the component FFmpeg. The manipulation leads to argument injection. This vulnerability is traded as CVE-2025-31499. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Jellyfin up to 10.10.6. It has been rated as critical. This issue affects some unknown processing of the file /Videos//stream of the component FFmpeg. The manipulation with an unknown input leads to a argument injection vulnerability. Using CWE to declare the problem leads to CWE-88. The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Jellyfin is an open source self hosted media server. Versions before 10.10.7 are vulnerable to argument injection in FFmpeg. This can be leveraged to possibly achieve remote code execution by anyone with credentials to a low-privileged user. This vulnerability was previously reported in CVE-2023-49096 and patched in version 10.8.13, but the patch can be bypassed. The original fix sanitizes some parameters to make injection impossible, but certain unsanitized parameters can still be used for argument injection. The same unauthenticated endpoints are vulnerable: /Videos//stream and /Videos//stream., likely alongside similar endpoints in AudioController. This argument injection can be exploited to achieve arbitrary file write, leading to possible remote code execution through the plugin system. While the unauthenticated endpoints are vulnerable, a valid itemId is required for exploitation and any authenticated attacker could easily retrieve a valid itemId to make the exploit work. This vulnerability is patched in version 10.10.7.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-31499 since 03/28/2025. The exploitation is known to be difficult. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

Upgrading to version 10.10.7 eliminates this vulnerability.

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Productinfo

Name

• Jellyfin

Version

• 10.10.0
• 10.10.1
• 10.10.2
• 10.10.3
• 10.10.4
• 10.10.5
• 10.10.6

Website

• Product: https://github.com/jellyfin/jellyfin/

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