Unauthenticated File Read Vulnerability in Jellyfin Media Server
CVE-2026-35033

9.3CRITICAL

Key Information:

Vendor

Jellyfin

Status
Jellyfin
Vendor
CVE Published:
14 April 2026

What is CVE-2026-35033?

Jellyfin, an open-source self-hosted media server, has a vulnerability that allows unauthenticated users to read arbitrary files from the server. The vulnerability arises from the misuse of the StreamOptions query parameter, where the ParseStreamOptions method fails to validate the input properly. This lack of validation enables attackers to inject malicious ffmpeg commands that can access sensitive files, such as server configuration or user data. The affected endpoint, /Videos/{itemId}/stream, lacks authentication controls, although accessing valid item GUIDs typically requires user authentication. This issue was patched in version 10.11.7 to fortify security and mitigate the risk.

Affected Version(s)

jellyfin < 10.11.7

References

https://github.com/jellyfin/jellyfin/security/advisories/...
x_refsource_CONFIRM
https://github.com/jellyfin/jellyfin/releases/tag/v10.11.7
x_refsource_MISC

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.