CVE-2026-40035
CRITICAL
NVD
CVSS Score
9.1
Severity
CRITICAL
Published
Apr 08, 2026
Vendor
unknown
Description
Unfurl through 2025.08 contains an improper input validation vulnerability in config parsing that enables Flask debug mode by default. The debug configuration value is read as a string and passed directly to app.run(), causing any non-empty string to evaluate truthy, allowing attackers to access the Werkzeug debugger and disclose sensitive information or achieve remote code execution.