CVE-2026-40035
Critical · 9.1CVSS
9.1
EPSS
0.7%
Published
Apr 8, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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