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CVE-2026-49246— Jellyfin: Potential MKV attachment filename path traversal to RCE

Quick assessment

Affected
jellyfin jellyfin
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Jellyfin是Jellyfin团队开源的一款媒体服务器软件。 Jellyfin 10.11.10之前版本存在路径遍历漏洞，该漏洞源于路径清理不足，可能导致特制MKV文件中的伪造文件名标签在播放过程中重定向附件提取到任意绝对路径。

AI Predicted 7.5 Difficulty: Easy EPSS 0.37% · P31

Affected Version Matrix 1

VendorProduct Version RangeStatus
jellyfin jellyfin < 10.11.10 affected
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I. Basic Information for CVE-2026-49246

Vulnerability Information
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Vulnerability Title
Jellyfin: Potential MKV attachment filename path traversal to RCE
Source: CVE Program / CVE List V5
Vulnerability Description
Jellyfin is an open source self hosted media server. Prior to 10.11.10, a specifically crafted MKV file containing forged filename tags can be leveraged to exploit missing path sanitization during playback. Jellyfin treats the MKV file name tag on MKV attachments as trusted and passes it unsanitized into Path.Combine(attachmentFolder, fileName) inside PathManager.GetAttachmentPath. Because .NET's Path.Combine neither normalises .. nor rejects a rooted second argument, a crafted MKV can redirect Jellyfin's MKV attachment extraction to any absolute path on disk. This triggers on any playback action of the affected video on a client which will attempt to burn in the subtitles by default.g This vulnerability is fixed in 10.11.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Jellyfin 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jellyfin是Jellyfin团队开源的一款媒体服务器软件。 Jellyfin 10.11.10之前版本存在路径遍历漏洞，该漏洞源于路径清理不足，可能导致特制MKV文件中的伪造文件名标签在播放过程中重定向附件提取到任意绝对路径。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jellyfin jellyfin < 10.11.10 -

II. Public POCs for CVE-2026-49246

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III. Intelligence Information for CVE-2026-49246

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Vendor Advisories for CVE-2026-49246 (1)

Same Patch Batch · jellyfin · 2026-06-24 · 4 CVEs total

CVE-2026-48793 8.8 HIGH Jellyfin: Potential FFmpeg argument injection via unescaped subtitle file path
CVE-2026-49247 8.8 HIGH Jellyfin: Potential Authenticated path traversal in /ClientLog/Document
CVE-2026-49220 5.7 MEDIUM Jellyfin: Potential XSS in user management

IV. Related Vulnerabilities

Same product: jellyfin
Same vendor: jellyfin
Same weakness: CWE-22