{"id":"CVE-2026-78206","title":"exceljs through 4.4.0 decompresses all entries from supplied xlsx archives into memory without limits on entry size, total size, or compression ratio","summary":"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, e…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-409"],"published":"2026-08-24","updated":"2026-08-29","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-78206","references":[{"url":"https://github.com/exceljs/exceljs","label":"disclosure@vulncheck.com"},{"url":"https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js#L257-L281","label":"disclosure@vulncheck.com"},{"url":"https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-7cvf-3r55-r39q","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/exceljs-through-uncontrolled-resource-consumption-via-unbounded-xlsx-decompression","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00446,"epssPercentile":0.38071,"ingestedAt":"2026-08-29T21:42:33.158Z","slug":"CVE-2026-78206","body":"## Overview\n\nexceljs 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}