{"id":"CVE-2026-128346","aliases":[],"cve":{"records":[{"id":"CVE-2026-128346","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-11-13T01:20:43.213Z","published":"2026-11-13T09:33:31.709Z","modified":"2026-11-13T09:33:31.709Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-11-13T09:33:31.709Z"}],"references":[{"url":"https://github.com/exceljs/exceljs","tags":["product"],"source":"VulnCheck"},{"url":"https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-mp7v-gxhv-42h2","tags":["third-party-advisory"],"source":"VulnCheck"},{"url":"https://github.com/exceljs/exceljs/blob/v4.4.0/lib/stream/xlsx/workbook-reader.js#L111-L128","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://github.com/exceljs/exceljs/blob/v4.4.0/lib/stream/xlsx/workbook-reader.js#L140-L149","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/exceljs-through-4.4.0-resource-exhaustion-via-streaming-workbookreader-temporary-files","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-459","description":"Incomplete Cleanup","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 Resource Exhaustion via Streaming WorkbookReader Temporary Files","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"ExcelJS through 4.4.0 contains a resource leak vulnerability in the streaming WorkbookReader.parse that leaves temporary files and open descriptors when sheet parsing fails or iteration stops early. Attackers can repeatedly upload malformed multi-sheet workbooks with worksheets placed before xl/sharedStrings.xml to fill the temporary directory and exhaust file descriptors.","score":8.7,"severity":"high","published":"2026-11-13T09:33:31.709Z","modified":"2026-11-13T09:33:31.709Z","withdrawn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-2026-128346"}],"remediation":[],"references":["https://github.com/exceljs/exceljs","https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-mp7v-gxhv-42h2","https://github.com/exceljs/exceljs/blob/v4.4.0/lib/stream/xlsx/workbook-reader.js#L111-L128","https://github.com/exceljs/exceljs/blob/v4.4.0/lib/stream/xlsx/workbook-reader.js#L140-L149","https://www.vulncheck.com/advisories/exceljs-through-4.4.0-resource-exhaustion-via-streaming-workbookreader-temporary-files"],"sources":[{"name":"CVE","id":"CVE-2026-128346","modified":"2026-11-13T09:33:31.709Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-128346"}],"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":"2026-11-13T17:58:19.216Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T00:25:34.584Z"},"coverage":[{"source":"NVD","status":"refresh-failed","attemptedAt":"2026-11-14T09:15:33.077Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-14T09:05:36.435Z","attemptedAt":"2026-11-14T09:05:36.435Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-14T08:55:32.463Z","attemptedAt":"2026-11-14T08:55:32.463Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-14T08:55:32.412Z","attemptedAt":"2026-11-14T08:55:32.412Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-128346","url":"https://www.first.org/epss/","probability":0.0063,"percentile":0.50743,"date":"2026-11-13","checkedAt":"2026-11-14T08:55:32.412Z"},{"source":"ENISA EUVD","id":"EUVD-2026-125153","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-125153","modified":"Nov 13, 2026, 9:33:31 AM","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":"2026-11-14T08:55:32.463Z"},{"source":"GitHub Advisory Database","id":"GHSA-66pw-fcw9-5qqq","url":"https://github.com/advisories/GHSA-66pw-fcw9-5qqq","modified":"2026-11-13T12:31:49Z","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-14T09:05:36.435Z"}],"aiSummary":{"text":"ExcelJS through 4.4.0 has a resource leak vulnerability in WorkbookReader.parse, leaving temporary files and open descriptors when parsing fails. Attackers can upload malformed workbooks to exhaust file descriptors.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-14T03:36:04.704Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-128346"}]}}