{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-45820", "assignerOrgId": "22e2d327-25fe-45d7-9f0c-dcd23b7108df", "state": "PUBLISHED", "assignerShortName": "seal", "dateReserved": "2026-05-13T12:03:13.544Z", "datePublished": "2026-07-22T06:57:13.726Z", "dateUpdated": "2026-07-22T06:57:13.726Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "22e2d327-25fe-45d7-9f0c-dcd23b7108df", "shortName": "seal", "dateUpdated": "2026-07-22T06:57:13.726Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-835", "description": "CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')", "type": "CWE"}, {"lang": "en", "cweId": "CWE-400", "description": "CWE-400 Uncontrolled Resource Consumption", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-469", "descriptions": [{"lang": "en", "value": "CAPEC-469 HTTP DoS"}]}], "affected": [{"vendor": "101arrowz", "product": "fflate", "platforms": ["Linux", "macOS", "Windows"], "versions": [{"status": "affected", "version": "0.4.5", "lessThanOrEqual": "0.4.8", "versionType": "semver"}, {"status": "affected", "version": "0.5.0", "lessThanOrEqual": "0.5.3", "versionType": "semver"}, {"status": "affected", "version": "0.6.0", "lessThanOrEqual": "0.6.10", "versionType": "semver"}, {"status": "affected", "version": "0.7.0", "lessThanOrEqual": "0.7.4", "versionType": "semver"}, {"status": "affected", "version": "0.8.0", "lessThanOrEqual": "0.8.2", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "fflate through 0.8.2 is vulnerable to denial of service via an infinite loop in unzipSync(). A crafted ZIP archive with a central directory entry declaring compressed_size=0xFFFFFFFF (ZIP64 sentinel) but missing the required ZIP64 extra field tag 0x0001 causes z64e() to loop indefinitely due to out-of-bounds reads returning undefined, which coerces to 0, keeping the loop condition permanently true.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "fflate through 0.8.2 is vulnerable to denial of service via an infinite loop in unzipSync(). A crafted ZIP archive with a central directory entry declaring compressed_size=0xFFFFFFFF (ZIP64 sentinel) but missing the required ZIP64 extra field tag 0x0001 causes z64e() to loop indefinitely due to out-of-bounds reads returning undefined, which coerces to 0, keeping the loop condition permanently true."}]}], "references": [{"url": "https://github.com/101arrowz/fflate/blob/f7873560ad229c22c4b23b06c6a3806ffde77569/src/index.ts#L2714"}, {"url": "https://www.npmjs.com/package/fflate"}], "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": "UNREPORTED", "Safety": "NEGLIGIBLE", "Automatable": "YES", "Recovery": "USER", "valueDensity": "DIFFUSE", "vulnerabilityResponseEffort": "MODERATE", "providerUrgency": "AMBER", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.6, "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/E:U/S:N/AU:Y/R:U/V:D/RE:M/U:Amber"}}], "credits": [{"lang": "en", "value": "Seal Security", "type": "finder"}], "source": {"discovery": "INTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}}}

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