{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-40035", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-04-08T13:36:58.277Z", "datePublished": "2026-04-08T21:35:27.703Z", "dateUpdated": "2026-04-08T21:43:41.987Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-04-08T21:43:41.987Z"}, "title": "Unfurl - Werkzeug Debugger Exposure via String Config Parsing", "datePublic": "2026-01-28T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-489", "description": "CWE-489 Active Debug Code", "type": "CWE"}]}], "affected": [{"vendor": "obsidianforensics", "product": "unfurl", "packageName": "dfir-unfurl", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "2025.08", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>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.</p>"}]}], "references": [{"url": "https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-vg9h-jx4v-cwx2", "name": "GHSA Advisory GHSA-vg9h-jx4v-cwx2", "tags": ["vendor-advisory"]}, {"url": "https://www.vulncheck.com/advisories/dfir-unfurl-werkzeug-debugger-exposure-via-string-config-parsing", "name": "VulnCheck Advisory: dfir-unfurl - Werkzeug Debugger Exposure via String Config Parsing", "tags": ["third-party-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9.3, "vectorString": "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"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE", "baseSeverity": "CRITICAL", "baseScore": 9.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}}], "credits": [{"lang": "en", "value": "Mobasi Security Team", "type": "reporter"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "vulncheck"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-40035", "lastModified": "2026-04-08T22:16:24.010", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "disclosure@vulncheck.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}]}, "published": "2026-04-08T22:16:24.010", "references": [{"source": "disclosure@vulncheck.com", "url": "https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-vg9h-jx4v-cwx2"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/dfir-unfurl-werkzeug-debugger-exposure-via-string-config-parsing"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-489"}], "source": "disclosure@vulncheck.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,20250810]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "dfir-unfurl", "source": "cna", "vendor": "dfir-unfurl"}, "product": "dfir-unfurl", "vendor": "dfir-unfurl"}], "analysis": {"en": {"generated_at": "2026-04-08T23:26:17.020721+00:00", "value": {"mitigation_remediation": ["Upgrade to the latest Unfurl release that removes the configuration parsing flaw.", "If upgrading is not immediately possible, edit the configuration to set the debug flag to false or remove the debug entry entirely, ensuring the value cannot be coerced into a truthy string.", "Verify that the Werkzeug debugger is no longer accessible by attempting to hit the /debug URL or equivalent after changes.", "Apply hardening measures such as blocking network access to the debugger endpoints and enforcing strict file permissions on configuration files.", "Maintain monitoring for any attempts to enable debug mode or access the debugger."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "The vulnerability affects ObsidianForensics\u2019 Unfurl product up to and including the 2025.08 release. No other vendors or products are listed, and affected versions are those that use the default configuration parsing path described.", "description_and_impact": "Unfurl versions through 2025.08 contain an input validation flaw in configuration parsing. The debug mode setting is interpreted as a string and directly passed to Flask\u2019s app.run() without proper type checking. Because any non\u2011empty string evaluates as true, a malicious configuration can activate debug mode. This allows an attacker to access the Werkzeug debugger, view sensitive data, or execute arbitrary code on the host.", "risk_and_exploitability": "The flaw carries a CVSS score of 9.3 and is not present in the CISA KEV catalog. Exploitation requires an attacker who can supply or influence configuration contents, which may be achieved remotely if configuration files are exposed, or locally if an attacker has filesystem access. The severity is high and the likelihood of exploitation is significant given the ease of enabling debug mode through any non\u2011empty string. "}}}}, "created": "2026-04-09T08:16:23.583467+00:00", "updated": "2026-04-09T08:25:49.495471+00:00", "vendors": ["dfir-unfurl", "dfir-unfurl$PRODUCT$dfir-unfurl"]}