CVE-2026-27641
February 25, 2026
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.
Affected Packages
flask-reuploaded (PYTHON):
Affected version(s) >=0.3 <1.5.0Fix Suggestion:
Update to version 1.5.0flask-reuploaded (PYTHON):
Affected version(s) >=0.3 <1.5.0Fix Suggestion:
Update to version 1.5.0flask-reuploaded (PYTHON):
Affected version(s) >=0.3 <1.5.0Fix Suggestion:
Update to version 1.5.0flask-reuploaded (PYTHON):
Affected version(s) >=0.3 <1.5.0Fix Suggestion:
Update to version 1.5.0Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.17
