Vulnerability Details CVE-2026-35034
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 14.3%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-35034
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cpe:2.3:a:jellyfin:jellyfin:-
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cpe:2.3:a:jellyfin:jellyfin:10.0.0
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cpe:2.3:a:jellyfin:jellyfin:10.0.1
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cpe:2.3:a:jellyfin:jellyfin:10.0.2
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cpe:2.3:a:jellyfin:jellyfin:10.1.0
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cpe:2.3:a:jellyfin:jellyfin:10.10.0
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cpe:2.3:a:jellyfin:jellyfin:10.10.1
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cpe:2.3:a:jellyfin:jellyfin:10.10.2
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cpe:2.3:a:jellyfin:jellyfin:10.10.3
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cpe:2.3:a:jellyfin:jellyfin:10.10.4
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cpe:2.3:a:jellyfin:jellyfin:10.10.5
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cpe:2.3:a:jellyfin:jellyfin:10.10.6
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cpe:2.3:a:jellyfin:jellyfin:10.10.7
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cpe:2.3:a:jellyfin:jellyfin:10.11.0
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cpe:2.3:a:jellyfin:jellyfin:10.11.1
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cpe:2.3:a:jellyfin:jellyfin:10.11.2
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cpe:2.3:a:jellyfin:jellyfin:10.11.3
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cpe:2.3:a:jellyfin:jellyfin:10.11.4
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cpe:2.3:a:jellyfin:jellyfin:10.11.5
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cpe:2.3:a:jellyfin:jellyfin:10.11.6
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cpe:2.3:a:jellyfin:jellyfin:10.2.0
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cpe:2.3:a:jellyfin:jellyfin:10.2.1
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cpe:2.3:a:jellyfin:jellyfin:10.2.2
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cpe:2.3:a:jellyfin:jellyfin:10.3.0
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cpe:2.3:a:jellyfin:jellyfin:10.3.1
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cpe:2.3:a:jellyfin:jellyfin:10.3.2
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cpe:2.3:a:jellyfin:jellyfin:10.3.3
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cpe:2.3:a:jellyfin:jellyfin:10.3.4
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cpe:2.3:a:jellyfin:jellyfin:10.3.5
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cpe:2.3:a:jellyfin:jellyfin:10.3.6
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cpe:2.3:a:jellyfin:jellyfin:10.3.7
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cpe:2.3:a:jellyfin:jellyfin:10.4.0
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cpe:2.3:a:jellyfin:jellyfin:10.4.1
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cpe:2.3:a:jellyfin:jellyfin:10.4.2
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cpe:2.3:a:jellyfin:jellyfin:10.4.3
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cpe:2.3:a:jellyfin:jellyfin:10.5.0
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cpe:2.3:a:jellyfin:jellyfin:10.5.1
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cpe:2.3:a:jellyfin:jellyfin:10.5.2
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cpe:2.3:a:jellyfin:jellyfin:10.5.3
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cpe:2.3:a:jellyfin:jellyfin:10.5.4
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cpe:2.3:a:jellyfin:jellyfin:10.5.5
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cpe:2.3:a:jellyfin:jellyfin:10.6.0
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cpe:2.3:a:jellyfin:jellyfin:10.6.1
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cpe:2.3:a:jellyfin:jellyfin:10.6.2
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cpe:2.3:a:jellyfin:jellyfin:10.6.3
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cpe:2.3:a:jellyfin:jellyfin:10.6.4
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cpe:2.3:a:jellyfin:jellyfin:10.7.0
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cpe:2.3:a:jellyfin:jellyfin:10.7.1
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cpe:2.3:a:jellyfin:jellyfin:10.7.2
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cpe:2.3:a:jellyfin:jellyfin:10.7.3
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cpe:2.3:a:jellyfin:jellyfin:10.7.4
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cpe:2.3:a:jellyfin:jellyfin:10.7.5
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cpe:2.3:a:jellyfin:jellyfin:10.7.6
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cpe:2.3:a:jellyfin:jellyfin:10.7.7
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cpe:2.3:a:jellyfin:jellyfin:10.8.0
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cpe:2.3:a:jellyfin:jellyfin:10.8.1
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cpe:2.3:a:jellyfin:jellyfin:10.8.10
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cpe:2.3:a:jellyfin:jellyfin:10.8.11
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cpe:2.3:a:jellyfin:jellyfin:10.8.12
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cpe:2.3:a:jellyfin:jellyfin:10.8.13
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cpe:2.3:a:jellyfin:jellyfin:10.8.2
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cpe:2.3:a:jellyfin:jellyfin:10.8.3
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cpe:2.3:a:jellyfin:jellyfin:10.8.4
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cpe:2.3:a:jellyfin:jellyfin:10.8.5
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cpe:2.3:a:jellyfin:jellyfin:10.8.6
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cpe:2.3:a:jellyfin:jellyfin:10.8.7
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cpe:2.3:a:jellyfin:jellyfin:10.8.8
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cpe:2.3:a:jellyfin:jellyfin:10.8.9
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cpe:2.3:a:jellyfin:jellyfin:10.9.0
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cpe:2.3:a:jellyfin:jellyfin:10.9.1
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cpe:2.3:a:jellyfin:jellyfin:10.9.10
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cpe:2.3:a:jellyfin:jellyfin:10.9.11
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cpe:2.3:a:jellyfin:jellyfin:10.9.2
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cpe:2.3:a:jellyfin:jellyfin:10.9.3
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cpe:2.3:a:jellyfin:jellyfin:10.9.4
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cpe:2.3:a:jellyfin:jellyfin:10.9.5
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cpe:2.3:a:jellyfin:jellyfin:10.9.6
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cpe:2.3:a:jellyfin:jellyfin:10.9.7
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cpe:2.3:a:jellyfin:jellyfin:10.9.8
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cpe:2.3:a:jellyfin:jellyfin:10.9.9