Main Vulnerability Database Vulnerabilities #VU126129

Path traversal in Jellyfin - CVE-2026-35031

Published: April 15, 2026 / Updated: April 17, 2026

Vulnerability identifier: #VU126129

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-35031

CWE-ID: CWE-22

Exploitation vector: Remote access

Exploit availability: Public exploit is available

Vulnerability details

The vulnerability allows a remote user to execute arbitrary code.

The vulnerability exists due to path traversal in the subtitle upload endpoint when processing the Format field in subtitle upload requests. A remote user can upload a specially crafted subtitle to write arbitrary files and chain the issue to execute arbitrary code.

Exploitation requires the Upload Subtitles permission.