Vulnerability record
CVE-2026-126499
The short answer
CVE-2026-126499 affects jellyfin jellyfin and is rated high (CVSS 8.3). It is not in CISA's Known Exploited Vulnerabilities catalog.
What it is
Jellyfin before 12.0 contains a path traversal vulnerability in the DELETE /Library/VirtualFolders and POST /Library/VirtualFolders/Name endpoints that allows attackers to delete or move directories via unvalidated library names. Unauthenticated attackers can supply names like .. or absolute paths before setup completes to recursively delete the data directory and jellyfin.db.
Weakness: CWE-22.
Severity
8.3 high
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/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
Exploited (CISA KEV)
Not listed
CISA lists confirmed exploitation only
EPSS, next 30 days
No score
FIRST scores CVEs within a day of publication
How it can be exploited
- Attack vector
- Network
- Attack complexity
- High
- Attack requirements
- Present
- Privileges required
- None
- User interaction
- None
- Confidentiality impact
- None
- Integrity impact
- High
- Availability impact
- High
Affected products
jellyfin. NVD's record lists the exact affected versions.
References
- github.com/jellyfin/jellyfin/blob/v10.11.11/Emby.Server.Implementations/Library/LibraryManager.cs#L3255-L3275
- github.com/jellyfin/jellyfin/blob/v10.11.11/Jellyfin.Api/Controllers/LibraryStructureController.cs#L127-L176
- github.com/jellyfin/jellyfin/commit/0c560b22ce73323329645b836c9910abc257ce4e
- github.com/jellyfin/jellyfin/releases/tag/v12.0
- github.com/jellyfin/jellyfin/security/advisories/GHSA-6828-c7cx-hvqm
- www.vulncheck.com/advisories/jellyfin-before-12.0-path-traversal-via-library-virtualfolders-endpoints
Questions
Is CVE-2026-126499 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog as of 2026-11-11.
How do I fix CVE-2026-126499?
Follow the vendor advisory in the references below. NVD lists the affected versions under its configurations.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Awaiting Analysis. The description is NVD's text, quoted as published.
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