Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Jellyfin | Jellyfin | < 10.11.7 |
Related Weaknesses (CWE)
References
- https://github.com/jellyfin/jellyfin/releases/tag/v10.11.7ProductRelease Notes
- https://github.com/jellyfin/jellyfin/security/advisories/GHSA-v2jv-54xj-h76wVendor Advisory
FAQ
What is CVE-2026-35034?
CVE-2026-35034 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 authenti...
How severe is CVE-2026-35034?
CVE-2026-35034 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-35034?
Check the references section above for vendor advisories and patch information. Affected products include: Jellyfin Jellyfin.