CVE-2026-72838: FileBrowser before 2.63.19 Disk Exhaustion via TUS Upload

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-14 · updated 2026-09-08
Weakness: CWE-770

Description

FileBrowser versions before 2.63.19 fail to enforce the declared Upload-Length in the TUS resumable-upload PATCH endpoint, allowing authenticated users to write arbitrary data to disk. Attackers can send oversized request bodies that exceed the declared upload length to exhaust available disk space and cause service unavailability.

Affected products

filebrowser: before 2.63.19 — fixed in 2.63.19

How to fix

Upgrade to a fixed version: filebrowser 2.63.19. Check the vendor advisory for mitigations.

References

https://github.com/filebrowser/filebrowser/commit/4daddec6f200b03a721197d8c0b4b652c994894e
https://github.com/filebrowser/filebrowser/security/advisories/GHSA-ffv3-7h97-993q
https://www.vulncheck.com/advisories/filebrowser-before-disk-exhaustion-via-tus-upload

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