Path Traversal in Jellyfin
CVE-2026-35031
Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain a vulnerability chain in the subtitle upload endpoint (POST /Videos/{itemId}/Subtitles), where the Format field is not validated, allowing path traversa…
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.007 (71.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Jellyfin — versions < 10.11.7
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/jellyfin/jellyfin/security/advisories/GHSA-j2hf-x4q5-47j3 (x_refsource_CONFIRM)
- https://github.com/jellyfin/jellyfin/releases/tag/v10.11.7 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-35031?
- CVE-2026-35031 is a critical-severity vulnerability in Jellyfin, classified under Improper Input Validation. CVSS score: 10.0/10. Published 2026-04-14.
- How severe is CVE-2026-35031?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2026-35031 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.