{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-40036", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-04-08T13:39:22.099Z", "datePublished": "2026-04-08T21:35:28.460Z", "dateUpdated": "2026-04-08T21:50:14.341Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-04-08T21:50:14.341Z"}, "title": "Unfurl < 2026.04 - Denial of Service via Unbounded zlib Decompression", "datePublic": "2026-01-28T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}, {"descriptions": [{"lang": "en", "cweId": "CWE-409", "description": "CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)", "type": "CWE"}]}], "affected": [{"vendor": "obsidianforensics", "product": "unfurl", "packageName": "dfir-unfurl", "repo": "https://github.com/obsidianforensics/unfurl", "versions": [{"status": "affected", "version": "0", "lessThan": "2026.04", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Unfurl before\u00a02026.04 contains an unbounded zlib decompression vulnerability in parse_compressed.py that allows remote attackers to cause denial of service. Attackers can submit highly compressed payloads via URL parameters to the /json/visjs endpoint that expand to gigabytes, exhausting server memory and crashing the service.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Unfurl before&nbsp;2026.04 contains an unbounded zlib decompression vulnerability in parse_compressed.py that allows remote attackers to cause denial of service. Attackers can submit highly compressed payloads via URL parameters to the /json/visjs endpoint that expand to gigabytes, exhausting server memory and crashing the service.</p>"}]}], "references": [{"url": "https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-h5qv-qjv4-pc5m", "name": "GHSA Advisory GHSA-h5qv-qjv4-pc5m", "tags": ["vendor-advisory"]}, {"url": "https://github.com/obsidianforensics/unfurl/releases/tag/v2026.04", "name": "VulnCheck Advisory: dfir-unfurl - Denial of Service via Unbounded zlib Decompression", "tags": ["release-notes", "patch"]}, {"url": "https://www.vulncheck.com/advisories/dfir-unfurl-denial-of-service-via-unbounded-zlib-decompression", "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": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "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": "HIGH", "baseScore": 8.7, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseSeverity": "HIGH", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}}], "credits": [{"lang": "en", "value": "Mobasi Security Team", "type": "reporter"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "vulncheck"}}}}

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