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: 0.008 (51.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.9 (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
- security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
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: 9.9/10. Published 2026-04-14.
- How severe is CVE-2026-35031?
- Critical severity. CVSS v3 base score is 9.9 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.