CVE-2026-27641

critical · 9.8

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.

9.8

CVSS

1.2%

EPSS (exploit prob.)

67th

EPSS percentile

2026-02-25

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-1336CWE-22

Affected products

Vendor	Product	Affected versions
jugmac00	flask-reuploaded	< 1.5.0

Check a specific version with /api/v1/cve/match.

References

https://github.com/jugmac00/flask-reuploaded/commit/d64c6b2f71cb73734fc38baa0e3e156926361288
https://github.com/jugmac00/flask-reuploaded/pull/180
https://github.com/jugmac00/flask-reuploaded/security/advisories/GHSA-65mp-fq8v-56jr

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-27641