How severe is CVE-2026-35034?

CVE-2026-35034 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-35034 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35034?

CVE-2026-35034 affects Jellyfin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35034?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-35034 have an EU (EUVD) identifier?

Yes. CVE-2026-35034 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22770.

When was CVE-2026-35034 published?

CVE-2026-35034 was published on 2026-04-14 and last updated on 2026-06-17.

CVE-2026-35034

CVE-2026-35034 is a medium-severity vulnerability in Jellyfin with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-22770
Weakness: CWE-400
Affected product: Jellyfin
Published: 2026-04-14
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-35034?: CVE-2026-35034 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-35034 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35034?: CVE-2026-35034 affects Jellyfin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35034?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-35034 have an EU (EUVD) identifier?: Yes. CVE-2026-35034 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22770.
When was CVE-2026-35034 published?: CVE-2026-35034 was published on 2026-04-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jellyfin:jellyfin:*:*:*:*:*:*:*:*

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