Critical severity9.1NVD Advisory· Published Apr 8, 2026· Updated Jul 24, 2026
CVE-2026-40035
CVE-2026-40035
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.
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Affected products
1Patches
Vulnerability mechanics
References
2- github.com/obsidianforensics/unfurl/security/advisories/GHSA-vg9h-jx4v-cwx2nvdExploitVendor Advisory
- www.vulncheck.com/advisories/dfir-unfurl-werkzeug-debugger-exposure-via-string-config-parsingnvdThird Party Advisory
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