CVE-2026-78206
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.
Scoring
- Severity
- HIGH
- CVSS base 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
- EPSS probability
- 0.45%
- CWE
- CWE-409
- Published
- 2026-08-24
- Last modified
- 2026-08-29
Affected products
- exceljs exceljs
Weakness type
Related vulnerabilities
- CVE-2026-79695 — Dell SCG 5.0 Appliance versions prior to 5.36.00.16 and Dell SCG 5.0 Application versions prior to...
- CVE-2026-69304 — ASP.NET Core Denial of Service Vulnerability
- CVE-2026-85786 — Incomplete fix for CVE-2026-75936 memory-amplification denial of service in Amazon ion-java
- CVE-2026-82520 — parsedmarc < 11.0.1 Zip Bomb DoS via Compressed Email Attachments
- CVE-2026-84382 — HTTPX2: Streaming response decompression does not bound peak memory (decompression amplification)
- CVE-2026-78594 — Improper Handling of Highly Compressed Data in APM Server Leading to Persistent Denial of Service
- CVE-2026-72628 — Improper Handling of Highly Compressed Data in Kibana Leading to Denial of Service
- CVE-2026-82864 — pdfme pdf-lib before 5.5.10 Denial of Service via Decompression Bomb