CVE-2026-35034: Jellyfin is an open source self hosted media server

Q: How do I fix CVE-2026-35034?

jellyfin: upgrade to 10.11.7. Exact commands for each OS are on this page.

Q: Is CVE-2026-35034 being exploited?

CVE-2026-35034 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-35034 affect?

CVE-2026-35034 affects jellyfin. Severity is medium (CVSS 6.5). 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

Q: How urgent is CVE-2026-35034?

Priority 27/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-35034 is a medium-severity flaw (CVSS 6.5) affecting jellyfin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 an

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-400
Published	2026-04-14
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: jellyfin

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-14 23:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

jellyfin jellyfin UPGRADE

Affected: < 10.11.7

Fixed in: 10.11.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jellyfin || rpm -q jellyfin || jellyfin --version

2. UPGRADE to 10.11.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jellyfin

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jellyfin

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35034?

jellyfin: upgrade to 10.11.7. Exact commands for each OS are on this page.

Is CVE-2026-35034 being exploited?

CVE-2026-35034 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35034 affect?

CVE-2026-35034 affects jellyfin. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2026-35034?

Priority 27/100. No elevated risk signals yet.

Software pages

Jellyfin vulnerabilities

Related CVEs

CVE-2026-35031 CRITICAL 9.9 UPGRADE Jellyfin is an open source self hosted media server
CVE-2026-35033 CRITICAL 9.1 UPGRADE Jellyfin is an open source self hosted media server
CVE-2026-35032 HIGH 8.1 UPGRADE Jellyfin is an open source self hosted media server

References

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