{"id":"CVE-2026-107224","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-107224","generatedAt":"2026-10-28T01:02:53.942Z","title":"When a crafted Zip64 entry declares an uncompressed size from 2^63 through 2^64-1 and the workbook is opened, the negative size bypasses unzip limits and reaches make as a negative capacity, allowing an attacker to panic during workbook opening.","description":"Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.1.0 to 2.11.0, a Zip64 uncompressed size with the high bit set is converted from uint64 to a negative int64 before signed size-limit checks and allocation. ReadZipReader obtains UncompressedSize64 through FileInfo.Size and passes the wrapped negative value to readFile. When a crafted Zip64 entry declares an uncompressed size from 2^63 through 2^64-1 and the workbook is opened, the negative size bypasses unzip limits and reaches make as a negative capacity, allowing an attacker to panic during workbook opening. No fixed version is available as of this review.","published":"2026-10-07T19:17:35.000Z","lastModified":"2026-10-13T14:17:32.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},"cwe":["CWE-190","CWE-681"],"affected":["excelize/excelize"],"epss":{"score":0.00306,"percentile":0.23229,"date":"2026-10-26","history":[{"date":"2026-10-08","score":0.00356,"percentile":0.2731}]},"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 (0.31%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-07T19:17:35.000Z","detail":{"score":"6.5","severity":"MEDIUM","publishedAt":"2026-10-07T19:17:35.140Z"},"summary":"New CVE, medium severity (CVSS 6.5)."}],"references":[{"url":"https://github.com/qax-os/excelize/commit/db93f8d89de71589069a54d1b998af02e3c5f7cd","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/qax-os/excelize/pull/2369","tags":["Issue Tracking","Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/qax-os/excelize/security/advisories/GHSA-fw94-4wwp-w8pw","tags":["Exploit","Vendor Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/qax-os/excelize/security/advisories/GHSA-fw94-4wwp-w8pw","tags":["Exploit","Vendor Advisory"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-107224","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."}