{"id":"CVE-2026-128340","aliases":[],"cve":{"records":[{"id":"CVE-2026-128340","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-11-13T01:20:41.029Z","published":"2026-11-13T09:33:35.713Z","modified":"2026-11-13T17:58:05.367Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-11-13T09:33:35.713Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-11-13T17:58:05.367Z"}],"references":[{"url":"https://github.com/exceljs/exceljs","tags":["product"],"source":"VulnCheck"},{"url":"https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-qvh4-wwpm-ggc8","tags":["third-party-advisory"],"source":"VulnCheck"},{"url":"https://github.com/exceljs/exceljs/blob/v4.4.0/lib/utils/cell-matrix.js#L28-L37","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/defined-names.js#L182-L193","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/exceljs-through-4.4.0-memory-exhaustion-via-oversized-defined-name-range","tags":["third-party-advisory"],"source":"VulnCheck"},{"url":"https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-qvh4-wwpm-ggc8","tags":["exploit"],"source":"CISA-ADP"}],"weaknesses":[{"id":"CWE-770","description":"Allocation of Resources Without Limits or Throttling","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":"2026-11-13T17:57:40.515144Z","decisions":[{"name":"Exploitation","value":"poc"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"title":"ExcelJS through 4.4.0 Memory Exhaustion via Oversized Defined Name Range","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"ExcelJS through 4.4.0 contains a memory exhaustion vulnerability that allows attackers to crash applications by supplying a workbook with an oversized defined-name range. DefinedNames.addEx expands ranges such as S!$A$1:$XFD$1048576 from xl/workbook.xml cell by cell, causing an uncatchable fatal heap out-of-memory error during xlsx.load().","score":8.7,"severity":"high","published":"2026-11-13T09:33:35.713Z","modified":"2026-11-13T17:58:05.367Z","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-2026-128340"}],"remediation":[],"references":["https://github.com/exceljs/exceljs","https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-qvh4-wwpm-ggc8","https://github.com/exceljs/exceljs/blob/v4.4.0/lib/utils/cell-matrix.js#L28-L37","https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/defined-names.js#L182-L193","https://www.vulncheck.com/advisories/exceljs-through-4.4.0-memory-exhaustion-via-oversized-defined-name-range"],"sources":[{"name":"CVE","id":"CVE-2026-128340","modified":"2026-11-13T17:58:05.367Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-128340"}],"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":"2026-11-13T19:45:18.479Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T00:40:33.739Z"},"coverage":[{"source":"NVD","status":"refresh-failed","attemptedAt":"2026-11-14T01:35:32.444Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-14T01:25:34.485Z","attemptedAt":"2026-11-14T01:25:34.485Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-14T01:25:32.746Z","attemptedAt":"2026-11-14T01:25:32.746Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-14T01:25:32.664Z","attemptedAt":"2026-11-14T01:25:32.664Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-128340","url":"https://www.first.org/epss/","probability":0.0063,"percentile":0.50745,"date":"2026-11-13","checkedAt":"2026-11-14T01:25:32.664Z"},{"source":"ENISA EUVD","id":"EUVD-2026-125037","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-125037","modified":"Nov 13, 2026, 5:58:05 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":"2026-11-14T01:25:32.746Z"},{"source":"GitHub Advisory Database","id":"GHSA-h6w2-rfp5-4jxx","url":"https://github.com/advisories/GHSA-h6w2-rfp5-4jxx","modified":"2026-11-13T12:31:48Z","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-14T01:25:34.485Z"}],"aiSummary":{"text":"ExcelJS through version 4.4.0 has a memory exhaustion vulnerability via oversized defined name ranges, potentially crashing applications. Attackers can supply a malicious workbook to trigger this issue. The weakness is due to unthrottled resource allocation.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-14T01:01:03.714Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-128340"}]}}