CVE-2026-40035

Critical

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.

SeverityCritical

CVSS9.1

Exploit probability—

ProductRyandfir Unfurl

PublishedApr 8, 2026

First seenApr 8, 2026

Weakness typeCWE-489CWE-489

How to fix

Vendor advisories

github.com/obsidianforensics/unfurl/security/advisories/GHSA-vg9h-jx4v-cwx2

Affected products

Product	Affected versions	Fixed in
ryandfir unfurl	v ≤ 2025.08	—
dfir-unfurlPyPI	v ≤ 20250810	—

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