CVE-2026-35034
Jellyfin: Potential Application DoS from excessively large SyncPlay group names
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
12th
Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain a denial of service vulnerability in the SyncPlay group creation endpoint (POST /SyncPlay/New), where an authenticated user can create groups with names of unlimited size due to insufficient input validation. By sending large payloads combined with arbitrary group IDs, an attacker can lock out the endpoint for other clients attempting to join SyncPlay groups and significantly increase the memory usage of the Jellyfin process, potentially leading to an out-of-memory crash. This issue has been fixed in version 10.11.7.
| CWE | CWE-400 |
| Vendor | jellyfin |
| Product | jellyfin |
| Published | Apr 14, 2026 |
| Last Updated | Apr 15, 2026 |
Stay Ahead of the Next One
Get instant alerts for jellyfin jellyfin
Be the first to know when new medium vulnerabilities affecting jellyfin jellyfin are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
jellyfin / jellyfin
< 10.11.7