CVE-2026-78206
High
Description
exceljs through 4.4.0 decompresses all entries from supplied xlsx archives into memory without limits on entry size, total size, or compression ratio. Attackers can upload highly compressed workbooks that expand to gigabytes in memory, exhausting available resources and causing denial of service.
SeverityHigh
CVSS7.5
Exploit probability—
ProductExceljs
PublishedAug 24, 2026
First seenAug 24, 2026
Weakness typeCWE-409CWE-409
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| exceljs exceljs | v ≤ 4.4.0 | — |
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