CVE-2026-128341

HighCVSS 7.5/10Last modified Nov 13, 2026

Description

ExcelJS through 4.4.0 contains a resource exhaustion vulnerability in data-validations-xform.js that allows attackers to exhaust CPU and memory by supplying unbounded sqref ranges. Attackers can provide a small crafted workbook with a sqref of A1:XFD1048576 to make xlsx.load() iterate billions of addresses, blocking the event loop and crashing the process with an uncatchable out-of-memory error.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-770

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
exceljs	exceljs	<= 4.4.0

References

Timeline

Published: Nov 13, 2026
Last modified: Nov 13, 2026
NVD status: Awaiting Analysis

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