CVE-2026-27641CRITICAL 9.8EPSS p59.7%

CVE-2026-27641CVE-2026-27641

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS1.05% probability of exploitation · percentile 59.7% · 2026-06-19T12:03:05Z
Published2026-02-25
Last modified2026-02-27

Underlying weaknesses· 2

CWE-1336CWE-22

References

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

2

TypeTargetConfidenceTier
WeaknessImproper Neutralization of Special Elements Used in a Template Enginecwe-13360%live
WeaknessImproper Limitation of a Pathname to a Restricted Directory ('Path Traversal')cwe-220%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.