Improper Neutralization of Special Elements Used in a Template Engine Affecting flask-reuploaded package, versions [,1.5.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-PYTHON-FLASKREUPLOADED-15363340
- published27 Feb 2026
- disclosed25 Feb 2026
- creditJaron Cabral
Introduced: 25 Feb 2026
CVE-2026-27641 (opens in a new tab)How to fix?
Upgrade Flask-Reuploaded to version 1.5.0 or higher.
Overview
Flask-Reuploaded is a Flexible and efficient upload handling for Flask
Affected versions of this package are vulnerable to Improper Neutralization of Special Elements Used in a Template Engine via the name parameter. An attacker can write arbitrary files and execute code on the server by supplying crafted input that triggers server-side template injection.
Workaround
This vulnerability can be mitigated by not passing user input to the name parameter, using auto-generated filenames only, and implementing strict input validation if name must be used.