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.
Published: 2026-04-08
Score: 9.3 Critical
EPSS: < 1% Very Low
KEV: No
Impact: Remote Code Execution
Action: Immediate Patch
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Fri, 17 Apr 2026 16:15:00 +0000

Type Values Removed Values Added
First Time appeared Ryandfir
Ryandfir unfurl
CPEs cpe:2.3:a:ryandfir:unfurl:*:*:*:*:*:*:*:*
Vendors & Products Ryandfir
Ryandfir unfurl

Thu, 09 Apr 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 09 Apr 2026 08:30:00 +0000

Type Values Removed Values Added
First Time appeared Dfir-unfurl
Dfir-unfurl dfir-unfurl
Vendors & Products Dfir-unfurl
Dfir-unfurl dfir-unfurl

Wed, 08 Apr 2026 22:15:00 +0000

Type Values Removed Values Added
Description dfir-unfurl through 20250810 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. 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.
Title dfir-unfurl - Werkzeug Debugger Exposure via String Config Parsing Unfurl - Werkzeug Debugger Exposure via String Config Parsing
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}


Wed, 08 Apr 2026 21:45:00 +0000

Type Values Removed Values Added
Description dfir-unfurl through 20250810 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.
Title dfir-unfurl - Werkzeug Debugger Exposure via String Config Parsing
Weaknesses CWE-489
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Dfir-unfurl Dfir-unfurl
Ryandfir Unfurl
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-05-08T14:07:04.785Z

Reserved: 2026-04-08T13:36:58.277Z

Link: CVE-2026-40035

cve-icon Vulnrichment

Updated: 2026-04-09T13:19:39.771Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-08T22:16:24.010

Modified: 2026-04-17T16:03:26.810

Link: CVE-2026-40035

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-09T08:25:49Z

Weaknesses