CVE-2026-128338
ExcelJS through 4.4.0 Memory Exhaustion via Unbounded Worksheet Column Range
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
exceljs through 4.4.0 contains a memory exhaustion vulnerability that allows attackers to crash applications by supplying a worksheet col element with an unbounded max attribute. Attackers can craft a small workbook with a huge max value, causing xlsx.load() to allocate hundreds of millions of Column objects and abort the process with an uncatchable heap out-of-memory error.
| CWE | CWE-770 |
| Vendor | exceljs |
| Product | exceljs |
| Published | Nov 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
exceljs / exceljs
0 ≤ 4.4.0
References
github.com: https://github.com/exceljs/exceljs github.com: https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-w57r-3mm6-w6g7 github.com: https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/column.js#L307-L316 github.com: https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xform/sheet/col-xform.js#L43-L47 vulncheck.com: https://www.vulncheck.com/advisories/exceljs-through-4.4.0-memory-exhaustion-via-unbounded-worksheet-column-range
Credits
Matéo Florian Callec