{"id":"CVE-2026-128345","aliases":[],"cve":{"records":[{"id":"CVE-2026-128345","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-11-13T01:20:42.856Z","published":"2026-11-13T09:33:32.358Z","modified":"2026-11-13T09:33:32.358Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-11-13T09:33:32.358Z"}],"references":[{"url":"https://github.com/exceljs/exceljs","tags":["product"],"source":"VulnCheck"},{"url":"https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-pr65-54q8-vhqm","tags":["third-party-advisory"],"source":"VulnCheck"},{"url":"https://github.com/exceljs/exceljs/blob/v4.4.0/lib/utils/shared-formula.js#L4-L12","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/exceljs-through-4.4.0-redos-via-slideformula-shared-formula-translation","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-1333","description":"Inefficient Regular Expression Complexity","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":[]},"title":"ExcelJS through 4.4.0 ReDoS via slideFormula Shared Formula Translation","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"ExcelJS through 4.4.0 contains a regular expression denial of service vulnerability in slideFormula in lib/utils/shared-formula.js when translating shared formulas to child cells. Attackers can supply a crafted spreadsheet with very long master formulas, such as runs of hyphens, causing quadratic regex backtracking that blocks the Node.js event loop.","score":6.9,"severity":"medium","published":"2026-11-13T09:33:32.358Z","modified":"2026-11-13T09:33:32.358Z","withdrawn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-2026-128345"}],"remediation":[],"references":["https://github.com/exceljs/exceljs","https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-pr65-54q8-vhqm","https://github.com/exceljs/exceljs/blob/v4.4.0/lib/utils/shared-formula.js#L4-L12","https://www.vulncheck.com/advisories/exceljs-through-4.4.0-redos-via-slideformula-shared-formula-translation"],"sources":[{"name":"CVE","id":"CVE-2026-128345","modified":"2026-11-13T09:33:32.358Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-128345"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","score":6.9},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3}],"sourceAffected":[],"observedAt":"2026-11-13T17:58:17.697Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T00:40:33.739Z"},"coverage":[{"source":"NVD","status":"refresh-failed","attemptedAt":"2026-11-14T09:15:32.191Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-14T09:05:34.829Z","attemptedAt":"2026-11-14T09:05:34.829Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-14T08:55:32.083Z","attemptedAt":"2026-11-14T08:55:32.083Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-14T08:55:32.079Z","attemptedAt":"2026-11-14T08:55:32.079Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-128345","url":"https://www.first.org/epss/","probability":0.00524,"percentile":0.44986,"date":"2026-11-13","checkedAt":"2026-11-14T08:55:32.079Z"},{"source":"ENISA EUVD","id":"EUVD-2026-125154","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-125154","modified":"Nov 13, 2026, 9:33:32 AM","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","checkedAt":"2026-11-14T08:55:32.083Z"},{"source":"GitHub Advisory Database","id":"GHSA-4q98-w56f-7qh8","url":"https://github.com/advisories/GHSA-4q98-w56f-7qh8","modified":"2026-11-13T12:31:48Z","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","checkedAt":"2026-11-14T09:05:34.829Z"}],"aiSummary":{"text":"ExcelJS through 4.4.0 has a regular expression denial of service vulnerability in slideFormula. Attackers can supply a crafted spreadsheet, causing quadratic regex backtracking. This blocks the Node.js event loop.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-14T03:36:01.269Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-128345"}]}}