Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/exceljs/exceljs
- https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js#L257-L281
- https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-7cvf-3r
- https://www.vulncheck.com/advisories/exceljs-through-uncontrolled-resource-consu
FAQ
What is CVE-2026-78206?
CVE-2026-78206 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2026-78206?
CVE-2026-78206 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-78206?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.