CVE-2026-35031

Name
CVE-2026-35031
Description
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 traversal via the file extension and enabling arbitrary file write. This arbitrary file write can be chained into arbitrary file read via .strm files, database extraction, admin privilege escalation, and ultimately remote code execution as root via ld.so.preload. Exploitation requires an administrator account or a user that has been explicitly granted the "Upload Subtitles" permission. This issue has been fixed in version 10.11.7. If users are unable to upgrade immediately, they can grant non-administrator users Subtitle upload permissions to reduce attack surface.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
security-advisories@github.com https://github.com/jellyfin/jellyfin/releases/tag/v10.11.7
security-advisories@github.com https://github.com/jellyfin/jellyfin/security/advisories/GHSA-j2hf-x4q5-47j3

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:jellyfin:jellyfin:*:*:*:*:*:*:*:* jellyfin >= None < 10.11.7

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
jellyfin edge-community 10.11.6-r4 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin edge-community 10.11.6-r3 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin edge-community 10.11.6-r1 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin edge-community 10.11.6-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin edge-community 10.11.5-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin edge-community 10.11.4-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin edge-community 10.11.3-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin edge-community 10.11.1-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin edge-community 10.11.0-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin edge-community 10.10.7-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin edge-community 10.10.6-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin edge-community 10.10.5-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin edge-community 10.10.4-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin edge-community 10.10.3-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin 3.23-community 10.11.6-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin 3.23-community 10.11.5-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable
jellyfin 3.23-community 10.11.4-r0 Simon Zeni <simon@bl4ckb0ne.ca> possibly vulnerable