filebrowser from version 2.24.0 contains a race condition in the TUS upload handler that allows authenticated users to write past the declared… (CVE-2026-82238)
Description
filebrowser version 2.24.0 contains a race condition vulnerability in its TUS upload handler. Authenticated users can exploit this flaw by sending concurrent PATCH requests at the same offset, allowing them to write beyond the declared Upload-Length. This bypasses length validation and can trigger completion hooks for oversized uploads.
CVSS v3.1
Score 3.1low
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in filebrowser starting from version 2.24.0 is a race condition in the TUS upload handler. Authenticated users can send multiple simultaneous PATCH requests targeting the same offset, which allows them to circumvent the declared Upload-Length restriction. This results in files exceeding their declared size and triggers completion hooks for these oversized uploads. The issue is identified as CWE-367 (Time-of-check Time-of-use race condition).
Potential Impact
The vulnerability allows authenticated users to write data beyond the declared upload size, potentially causing unexpected behavior in the application such as triggering completion hooks for oversized files. The CVSS score is low (3.1), indicating limited impact with no confidentiality or integrity loss, and only low impact on availability.
Mitigation Recommendations
No patch or official fix information is currently available. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is released, limit access to authenticated users and monitor for unusual upload activity related to concurrent PATCH requests.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-6fr9-pm38-mc2g
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-82238"]
- Database Specific Severity
- LOW
- Cvss Version
- 3.1
Threat ID: 6a91a7bbacd9273b490650bf
Added to database: 08/28/2026, 15:22:35 UTC
Last enriched: 09/10/2026, 02:23:23 UTC
Last updated: 10/13/2026, 18:48:24 UTC
Views: 45
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