{"id":"CVE-2026-45820","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-45820","generatedAt":"2026-10-28T02:14:05.159Z","title":"fflate through 0.8.2 is vulnerable to denial of service via an infinite loop in unzipSync().","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.","published":"2026-07-22T08:16:23.000Z","lastModified":"2026-10-24T17:10:00.000Z","status":"Analyzed","sourceIdentifier":"22e2d327-25fe-45d7-9f0c-dcd23b7108df","cvss":{"version":"4.0","score":6.6,"severity":"MEDIUM","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/M"},"cwe":["CWE-400","CWE-835"],"affected":["101arrowz/fflate"],"epss":{"score":0.00279,"percentile":0.20152,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.28%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/101arrowz/fflate/blob/f7873560ad229c22c4b23b06c6a3806ffde77569/src/index.ts#L2714","tags":["Patch"],"source":"22e2d327-25fe-45d7-9f0c-dcd23b7108df"},{"url":"https://www.npmjs.com/package/fflate","tags":["Product"],"source":"22e2d327-25fe-45d7-9f0c-dcd23b7108df"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45820","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}