{"id":"CVE-2026-78206","aliases":[],"cve":{"records":[{"id":"CVE-2026-78206","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-08-24T00:15:01.655Z","published":"2026-08-24T00:30:46.462Z","modified":"2026-11-08T14:09:03.140Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-11-08T14:09:03.140Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-08-26T18:09:57.395Z"}],"references":[{"url":"https://github.com/exceljs/exceljs","tags":["product"],"source":"VulnCheck"},{"url":"https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-7cvf-3r55-r39q","tags":["third-party-advisory","vendor-advisory"],"source":"VulnCheck"},{"url":"https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js#L257-L281","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/exceljs-through-uncontrolled-resource-consumption-via-unbounded-xlsx-decompression","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-409","description":"Improper Handling of Highly Compressed Data (Data Amplification)","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:exceljs_project:exceljs:*:*:*:*:*:*:*:*","versionEndIncluding":"4.4.0"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-08-26T18:09:41.294502Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"title":"exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression","titleSource":"VulnCheck","descriptionSource":"VulnCheck","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service.","score":8.7,"severity":"high","published":"2026-08-24T00:30:46.462Z","modified":"2026-11-08T14:09:03.140Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"exceljs","name":"exceljs","platforms":[],"versions":[{"version":"0","status":"affected","lessThanOrEqual":"4.4.0","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:npm/exceljs","packageIdentity":{"ecosystem":"npm","name":"exceljs"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-78206"}],"remediation":[],"references":["https://github.com/exceljs/exceljs","https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-7cvf-3r55-r39q","https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js#L257-L281","https://www.vulncheck.com/advisories/exceljs-through-uncontrolled-resource-consumption-via-unbounded-xlsx-decompression"],"sources":[{"name":"CVE","id":"CVE-2026-78206","modified":"2026-11-08T14:09:03.140Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-78206"}],"assessments":[{"source":"VulnCheck","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","score":8.7},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5}],"sourceAffected":[],"observedAt":"2026-11-08T14:31:49.610Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T00:20:33.177Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-11-08T15:05:37.951Z","attemptedAt":"2026-11-08T15:05:37.951Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-08T15:05:38.460Z","attemptedAt":"2026-11-08T15:05:38.460Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-08T15:05:38.463Z","attemptedAt":"2026-11-08T15:05:38.463Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-08T15:05:37.950Z","attemptedAt":"2026-11-08T15:05:37.950Z"}],"evidence":[{"source":"NVD","id":"CVE-2026-78206","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-78206","modified":"2026-10-14T13:10:00.187","score":8.7,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-11-08T15:05:37.951Z"},{"source":"NVD","id":"CVE-2026-78206","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-78206","modified":"2026-10-14T13:10:00.187","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-08T15:05:37.951Z"},{"source":"FIRST EPSS","id":"CVE-2026-78206","url":"https://www.first.org/epss/","probability":0.0063,"percentile":0.50456,"date":"2026-11-08","checkedAt":"2026-11-08T15:05:37.950Z"},{"source":"GitHub Advisory Database","id":"GHSA-r7gv-hxj8-94c4","url":"https://github.com/advisories/GHSA-r7gv-hxj8-94c4","modified":"2026-08-24T03:31:06Z","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-08T15:05:38.460Z"},{"source":"ENISA EUVD","id":"EUVD-2026-64681","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-64681","modified":"Nov 8, 2026, 2:09:03 PM","score":8.7,"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","checkedAt":"2026-11-08T15:05:38.463Z"}],"aiSummary":{"text":"exceljs through 4.4.0 is vulnerable to uncontrolled resource consumption via unbounded xlsx decompression, allowing attackers to cause denial of service. The vulnerability occurs when decompressing supplied xlsx archives into memory without limits. Attackers can upload highly compressed workbooks that expand to gigabytes in memory, exhausting available resources.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-08T14:41:12.264Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-78206"}]}}