CVE-2026-78206: fallo de gravedad alta en exceljs
exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression
Publicada el · Actualizada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
21Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 8.7epss 0.6%
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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Productos afectados
exceljs · exceljsCVEs relacionadas — exceljs
En el mismo producto, de las más peligrosas a las menos.
CVE-2026-78207CRITICALexceljs through 4.4.0 Prototype Pollution via deepMerge Reached From Note SerializationEPSS 0.6%CVE-2026-78208HIGHexceljs through 4.4.0 Path Traversal via Unvalidated addImage filenameEPSS 0.5%CVE-2026-78209HIGHexceljs through 4.4.0 CSV Formula Injection via Unescaped Cell ValuesEPSS 0.4%
Referencias
https://github.com/exceljs/exceljshttps://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js#L257-L281https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-7cvf-3r55-r39qhttps://www.vulncheck.com/advisories/exceljs-through-uncontrolled-resource-consumption-via-unbounded-xlsx-decompression