exceljs through 4.4.0 decompresses all entries from supplied xlsx archives into memory without limits on entry size, total size, or compression ratio.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com
• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Aug 24, 2026 · NIST NVD

   Detected

   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.

2. Oct 14, 2026 · NIST NVD

   Updated

   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.

Sources

• CVE.orgVulnerability recordCVE-2026-78206

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-78206

  30-day exploitation probability 0.6%

  first.org
• NIST NVDVulnerability recordCVE-2026-78206

  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 d

  nvd.nist.gov

References

• Reference · github.com
• Reference · github.com
• Reference · github.com
• Reference · vulncheck.com