CVE-2026-27641
Critical
Description
Flask-Reuploaded provides file uploads for Flask. A critical path traversal and extension bypass vulnerability in versions prior to 1.5.0 allows remote attackers to achieve arbitrary file write and remote code execution through Server-Side Template Injection (SSTI). Flask-Reuploaded has been patched in version 1.5.0. Some workarounds are available. Do not pass user input to the `name` parameter, use auto-generated filenames only, and implement strict input validation if `name` must be used.
SeverityCritical
CVSS9.8
Exploit probability—
ProductJugmac00 Flask-reuploaded
PublishedFeb 25, 2026
First seenFeb 25, 2026
Weakness typeCWE-1336CWE-1336
How to fix
Update
- jugmac00 flask-reuploaded1.5.0 or later
- flask-reuploaded1.5.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| jugmac00 flask-reuploaded | v < 1.5.0 | 1.5.0 |
| flask-reuploadedPyPI | v < 1.5.0 | 1.5.0 |
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