CVE-2026-40035

CriticalCVSS 9.1/10Last modified Oct 8, 2026

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.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-489

Affected software

No affected versions have been published.

Timeline

Published: Apr 8, 2026
Last modified: Oct 8, 2026
NVD status: Analyzed

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