{"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":"2026-07-22T12:53:38.246Z"},"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"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-22T12:53:26.309456Z","id":"CVE-2026-45820","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-22T12:53:38.246Z"}}]}}