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CVE-2026-35034

Jellyfin: Potential Application DoS from excessively large SyncPlay group names

Published: Apr 14, 2026Updated: Apr 17, 2026 Sources: CVE List NVD
NVD MITRE
6.5CVSS
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 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.

EPSS Score
0.0%
Top 88.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High

Weaknesses

CWE-400

Affected Products

jellyfin
jellyfin

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/jellyfin/jellyfin/security/advisories/GHSA-v2jv-54xj-h76w
github.com
https://github.com/jellyfin/jellyfin/releases/tag/v10.11.7
github.com

Timeline

Published
Apr 14, 2026
Last Updated
Apr 17, 2026

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