Vulnerabilities CVE-2026-78206

CVE-2026-78206

High

Open

TLP:CLEAR

exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression

NVD CVE.org

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Description

exceljs-hardened before 5.0.0 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.

Details

CVSS Score: 8.7
CVSS 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
Confidence: 90%
Published: Aug 24, 2026
Last Modified: Aug 24, 2026

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