CVE-2026-27641

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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/jugmac00/flask-reuploaded/commit/d64c6b2f71cb73734fc38baa0e3e156926361288	Patch
https://github.com/jugmac00/flask-reuploaded/pull/180	Issue Tracking Patch
https://github.com/jugmac00/flask-reuploaded/security/advisories/GHSA-65mp-fq8v-56jr	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:jugmac00:flask-reuploaded:*:*:*:*:*:python:*:*

History

No history.

Information

Published : 2026-02-25 04:16

Updated : 2026-02-27 18:40

NVD link : CVE-2026-27641

Mitre link : CVE-2026-27641

CVE.ORG link : CVE-2026-27641

JSON object : View

Products Affected

jugmac00

flask-reuploaded

CWE

CWE-1336

Improper Neutralization of Special Elements Used in a Template Engine

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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