CVE-2026-35034 Details
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.
A denial-of-service vulnerability has been identified in Jellyfin versions prior to 10.11.7. The issue arises in the SyncPlay group creation endpoint, where an authenticated user can create groups with names of unlimited length due to inadequate input validation. By sending large payloads along with arbitrary group IDs, an attacker can disrupt the endpoint for other clients trying to join SyncPlay groups. This exploitation significantly increases the memory usage of the Jellyfin process, potentially causing an out-of-memory crash.
Users are advised to upgrade to Jellyfin version 10.11.7 or later, where this vulnerability has been fixed. Instructions for upgrading can be found in the Jellyfin release notes.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/jellyfin/jellyfin/releases/tag/v10.11.7 | [email protected] | ProductRelease Notes |
| https://github.com/jellyfin/jellyfin/security/advisories/GHSA-v2jv-54xj-h76w | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-400 | Uncontrolled Resource Consumption | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| jellyfin jellyfin | < 10.11.7 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 23, 2026 | Initial Analysis | [email protected] |
| Apr 14, 2026 | New CVE Received | [email protected] |