GHSA-3wrp-r2q4-573cMediumCVSS 4.8
ExcelJS through 4.4.0 contains a prototype pollution vulnerability that allows attackers to add...
🔗 CVE IDs covered (1)
📋 Description
ExcelJS through 4.4.0 contains a prototype pollution vulnerability that allows attackers to add numeric keys to Object.prototype through a crafted defined name referencing a proto sheet. Attackers can supply an xlsx whose xl/workbook.xml definedName range targets proto, causing CellMatrix to write empty arrays onto Object.prototype process-wide when workbook.xlsx.load() runs.
🔗 References (7)
- https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-pwgq-2cgg-6ph9
- https://nvd.nist.gov/vuln/detail/CVE-2026-128336
- https://github.com/exceljs/exceljs
- https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/defined-names.js#L182-L193
- https://github.com/exceljs/exceljs/blob/v4.4.0/lib/utils/cell-matrix.js#L50-L52
- https://www.vulncheck.com/advisories/exceljs-through-4.4.0-prototype-pollution-via-proto-defined-name
- https://github.com/advisories/GHSA-3wrp-r2q4-573c