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Jellyfin CVE-2026-49246

| EUVDEUVD-2026-39029 LOW
Path Traversal (CWE-22)
2026-06-24 GitHub_M
Path Traversal Jellyfin
1.7
CVSS 4.0 · Vendor: GitHub_M

Severity by source

Vendor (GitHub_M) PRIMARY
1.7 LOW
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
3.1 LOW

AC:H for craft-and-deliver MKV requirement; UI:R because victim must actively play the file; I:L for bounded arbitrary file write; no confidentiality or availability impact.

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jun 24, 2026 - 20:03 EUVD
Analysis Generated
Jun 24, 2026 - 19:23 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Path traversal in Jellyfin prior to 10.11.10 enables an attacker who can place a crafted MKV file in a victim's Jellyfin library to redirect the server's MKV attachment extraction routine to arbitrary absolute filesystem paths on the host. The flaw originates in .NET's Path.Combine behavior: Jellyfin passes the unsanitized MKV filename tag directly into Path.Combine(attachmentFolder, fileName), and .NET silently ignores the base path when the second argument is rooted, enabling full path override. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft MKV with rooted filename tag
Delivery
Place file in Jellyfin media library
Exploit
Victim plays video with subtitle burn-in
Execution
Jellyfin calls Path.Combine with unsanitized tag
Persist
Attachment extracted to arbitrary filesystem path
Impact
Attacker-controlled file written on server
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Vulnerability AssessmentAI

Exploitation The MKV file must be present in a Jellyfin media library and must be played back by a Jellyfin client. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-assigned CVSS 4.0 score of 1.7 (vector 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) reflects the constrained real-world impact: only low integrity is affected (file write to arbitrary path), no confidentiality or availability is impacted, and exploitation status is Unreported. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts an MKV video file embedding an attachment whose filename tag is set to an absolute or path-traversal path such as '/etc/cron.d/backdoor'. The file is placed into a Jellyfin media library - either through a shared network folder, a compromised upload mechanism, or social engineering. …
Remediation Upgrade Jellyfin to version 10.11.10, which introduces path sanitization in PathManager.GetAttachmentPath to reject rooted second arguments and normalize '..' sequences before calling Path.Combine. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-22 – Path Traversal

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CVE-2026-49246 vulnerability details – vuln.today
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