High severity7.5NVD Advisory· Published Aug 24, 2026· Updated Aug 31, 2026

CVE-2026-78206

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Exceljs Project/Exceljsllm-fuzzy
Range: <=4.4.0

Patches

Vulnerability mechanics

References

github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.jsnvd
github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-7cvf-3r55-r39qnvd
www.vulncheck.com/advisories/exceljs-through-uncontrolled-resource-consumption-via-unbounded-xlsx-decompressionnvd

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