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CVE-2026-35031— Jellyfin: Potential RCE via subtitle upload path traversal + .strm chain

CVSS 10.0 · Critical EPSS 0.66% · P71
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I. Basic Information for CVE-2026-35031

Vulnerability Information
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Vulnerability Title
Jellyfin: Potential RCE via subtitle upload path traversal + .strm chain
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Jellyfin 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jellyfin是Jellyfin开源的一个免费软件媒体系统。可让您控制媒体的管理和流式传输。它是专有Emby和Plex的替代产品，可以通过多个应用程序将专用服务器中的媒体提供给最终用户设备。 Jellyfin 10.11.7之前版本存在安全漏洞，该漏洞源于字幕上传端点未验证Format字段，可能导致路径遍历和任意文件写入，进而引发远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

VendorProductAffected VersionsCPESubscribe
jellyfinjellyfin < 10.11.7 -

II. Public POCs for CVE-2026-35031

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III. Intelligence Information for CVE-2026-35031

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Same Patch Batch · jellyfin · 2026-04-14 · 4 CVEs total

CVE-2026-350346.5 MEDIUMJellyfin: Potential Application DoS from excessively large SyncPlay group names
CVE-2026-35032Jellyfin: Potential SSRF + Arbitrary file read via LiveTV M3U tuner
CVE-2026-35033Jellyfin: Potential SSRF + Arbitrary file read via stream argument injection

IV. Related Vulnerabilities

Same product: jellyfin
Same vendor: jellyfin
Same weakness: CWE-20

V. Comments for CVE-2026-35031

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