{"id":"CVE-2026-45820","revision":"62e78c76802f45efb102fc6f992a86cc","records":[{"revision":"62e78c76802f45efb102fc6f992a86cc","observedAt":"2026-10-25T12:17:14.897+00:00","statement":{"source":"nvd","id":"CVE-2026-45820","aliases":[],"title":"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 fie…","description":"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.","state":0,"publishedAt":"2026-07-22T08:16:23.28+00:00","modifiedAt":"2026-10-24T17:10:00.22+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · 22e2d327-25fe-45d7-9f0c-dcd23b7108df · Secondary","vector":"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/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:N/AU:Y/R:U/V:D/RE:M/U:Amber","score":6.6,"severity":"MEDIUM"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/101arrowz/fflate/blob/f7873560ad229c22c4b23b06c6a3806ffde77569/src/index.ts#L2714","https://www.npmjs.com/package/fflate"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-45820","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-400","CWE-835"],"productCriteria":["cpe:2.3:a:101arrowz:fflate:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-07-22T08:16:23.280","lastModified":"2026-10-24T17:10:00.220"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-45820","identifiers":["CVE-2026-45820"]},"retained":false,"historicalAffected":[]}],"coverage":[]}