Resource exhaustion in Jellyfin - CVE-2026-35034
Published: April 15, 2026
Vulnerability identifier: #VU126127
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-35034
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Jellyfin
Affected software:
Jellyfin
Jellyfin
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the SyncPlay API endpoint when creating SyncPlay groups with excessively large group names. A remote user can send a specially crafted request to cause a denial of service.
The issue can lock out the endpoint for clients attempting to join SyncPlay groups and may significantly increase memory usage, possibly leading to an out-of-memory crash.
How to mitigate CVE-2026-35034
Install security update from vendor's website.