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Advisories

ExcelJS through 4.4.0 Denial of Service via Oversized Worksheet sheetId

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Severity
high
Date
Affecting

  • exceljs <= 4.4.0

CWE
  • CWE-606 Unchecked Input for Loop Condition
CVSS
8.7
CVSS V4 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
Credit
Matéo Florian Callec
Description
ExcelJS through 4.4.0 contains a denial of service vulnerability that allows attackers to block the event loop by supplying an unbounded sheetId in xl/workbook.xml. Attackers can provide a workbook with a huge sheetId, making the sparse worksheet array walk stall worksheets, getWorksheet and writeBuffer for seconds.

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