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VULNERABILITIES

CVE-2026-40035 Details

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.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-vg9h-jx4v-cwx2 CISA-ADPExploitVendor Advisory
https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-vg9h-jx4v-cwx2 [email protected]ExploitVendor Advisory
https://www.vulncheck.com/advisories/dfir-unfurl-werkzeug-debugger-exposure-via-string-config-parsing [email protected]Third Party Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-489Active Debug Code[email protected]

Affected Products

ProductVersions
ryandfir unfurl
<= 2025.08

CPE

  • cpe:2.3:a:ryandfir:unfurl:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

6 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-40035
NVD Published Date:
Apr 8, 2026
NVD Last Modified:
Jul 24, 2026
Source:
[email protected]
CVE-2026-40035 Details - Not Deferred