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CVE-2026-78206 Details

UNDERGOING ENRICHMENT

The CVE is currently being enriched by the Volerion team. The enrichment process results in the association of reference link tags, CVSS, and CPE applicability statement data.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:…Vector:This vulnerability is currently being analyzed.

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/exceljs/exceljs	[email protected]
https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js#L257-L281	[email protected]
https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-7cvf-3r55-r39q	[email protected]
https://www.vulncheck.com/advisories/exceljs-through-uncontrolled-resource-consumption-via-unbounded-xlsx-decompression	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-409	Improper Handling of Highly Compressed Data (Data Amplification)	[email protected]

Affected Products

This vulnerability is currently being analyzed

Change History

4 change records found show changes

Date	Action	Recorded By
Aug 29, 2026	CVE Modified	[email protected]
Aug 26, 2026	CVE Modified	[email protected]
Aug 26, 2026	CVE Modified	CISA-ADP
Aug 24, 2026	New CVE Received	[email protected]