Vulnerability · Published Apr 14, 2026 · Assigned by GitHub_M

CVE-2026-35034Jellyfin: Potential Application DoS from excessively large SyncPlay group names

Medium 6.5

In plain English

A medium-severity uncontrolled resource consumption in jellyfin from jellyfin. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 82.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
jellyfin	jellyfin	< 10.11.7

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

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