{"id":"CVE-2026-128343","aliases":[],"cve":{"records":[{"id":"CVE-2026-128343","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-11-13T01:20:42.132Z","published":"2026-11-13T09:33:33.699Z","modified":"2026-11-13T22:31:35.264Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-11-13T09:33:33.699Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-11-13T22:31:35.264Z"}],"references":[{"url":"https://github.com/exceljs/exceljs","tags":["product"],"source":"VulnCheck"},{"url":"https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-3gm5-qxj8-89rr","tags":["third-party-advisory"],"source":"VulnCheck"},{"url":"https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xform/sheet/row-xform.js#L73-L77","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/worksheet.js#L886-L893","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/worksheet.js#L571-L580","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/exceljs-through-4.4.0-denial-of-service-via-oversized-row-number","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-606","description":"Unchecked Input for Loop Condition","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:exceljs_project:exceljs:*:*:*:*:*:*:*:*","versionEndIncluding":"4.4.0"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-11-13T16:34:15.192985Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"title":"ExcelJS through 4.4.0 Denial of Service via Oversized Row Number","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"exceljs through 4.4.0 contains a denial of service vulnerability that allows attackers to block the event loop by supplying unbounded row r attributes parsed in row-xform.js. Attackers can craft an XLSX file with a row numbered far beyond Excel's limit, making getSheetValues(), workbook writes and CSV export consume time proportional to that number.","score":8.7,"severity":"high","published":"2026-11-13T09:33:33.699Z","modified":"2026-11-13T22:31:35.264Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"exceljs","name":"exceljs","platforms":[],"versions":[{"version":"0","status":"affected","lessThanOrEqual":"4.4.0","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:npm/exceljs","packageIdentity":{"ecosystem":"npm","name":"exceljs"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-128343"}],"remediation":[],"references":["https://github.com/exceljs/exceljs","https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-3gm5-qxj8-89rr","https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xform/sheet/row-xform.js#L73-L77","https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/worksheet.js#L886-L893","https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/worksheet.js#L571-L580","https://www.vulncheck.com/advisories/exceljs-through-4.4.0-denial-of-service-via-oversized-row-number"],"sources":[{"name":"CVE","id":"CVE-2026-128343","modified":"2026-11-13T22:31:35.264Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-128343"}],"assessments":[{"source":"VulnCheck","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","score":8.7},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5}],"sourceAffected":[],"observedAt":"2026-11-13T23:02:12.587Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T00:40:33.739Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-11-13T23:06:02.952Z","attemptedAt":"2026-11-13T23:06:02.952Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-13T23:05:35.525Z","attemptedAt":"2026-11-13T23:05:35.525Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-13T23:05:36.361Z","attemptedAt":"2026-11-13T23:05:36.361Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-13T23:05:34.966Z","attemptedAt":"2026-11-13T23:05:34.966Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-128343","url":"https://www.first.org/epss/","probability":0.00684,"percentile":0.53119,"date":"2026-11-13","checkedAt":"2026-11-13T23:05:34.966Z"},{"source":"GitHub Advisory Database","id":"GHSA-xch6-rmr7-fh84","url":"https://github.com/advisories/GHSA-xch6-rmr7-fh84","modified":"2026-11-13T12:31:43Z","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-13T23:05:35.525Z"},{"source":"ENISA EUVD","id":"EUVD-2026-125156","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-125156","modified":"Nov 13, 2026, 10:31:35 PM","score":8.7,"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","checkedAt":"2026-11-13T23:05:36.361Z"},{"source":"NVD","id":"CVE-2026-128343","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-128343","modified":"2026-11-13T15:48:52.237","score":8.7,"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:X/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:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-11-13T23:06:02.952Z"},{"source":"NVD","id":"CVE-2026-128343","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-128343","modified":"2026-11-13T15:48:52.237","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-13T23:06:02.952Z"}],"aiSummary":{"text":"ExcelJS through 4.4.0 has a denial of service vulnerability via oversized row numbers, allowing attackers to block the event loop. Attackers can craft an XLSX file with a large row number, affecting getSheetValues and workbook writes. This is due to unchecked input for loop conditions.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-13T23:06:11.241Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-128343"}]}}