{"id":"CVE-2026-119051","aliases":[],"cve":{"records":[{"id":"CVE-2026-119051","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-29T11:51:51.276Z","published":"2026-10-29T13:08:52.215Z","modified":"2026-10-29T13:08:52.215Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-10-29T13:08:52.215Z"}],"references":[{"url":"https://github.com/hughsk/flat/issues/195","tags":["issue-tracking"],"source":"VulnCheck"},{"url":"https://github.com/hughsk/flat","tags":["product"],"source":"VulnCheck"},{"url":"https://github.com/hughsk/flat/blob/1d68e1d06c0210cff31e5c61ac177f3e2d3fa564/index.js#L65-L75","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://github.com/hughsk/flat/blob/1d68e1d06c0210cff31e5c61ac177f3e2d3fa564/index.js#L137-L142","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/flat-through-6.0.1-denial-of-service-via-unflatten-numeric-array-index-keys","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-770","description":"Allocation of Resources Without Limits or Throttling","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:flat_project:flat:*:*:*:*:*:*:*:*","versionEndIncluding":"6.0.1"}]}]}]}],"prioritization":[]},"title":"flat through 6.0.1 Denial of Service via unflatten() Numeric Array Index Keys","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"flat through 6.0.1 contains an uncontrolled resource allocation vulnerability in unflatten() that allows attackers to create huge sparse arrays via unbounded numeric keys. Attackers can supply flattened keys such as a.4294967294, causing iteration with forEach, spread or JSON.stringify to block the Node.js event loop.","score":8.2,"severity":"high","published":"2026-10-29T13:08:52.215Z","modified":"2026-10-29T13:08:52.215Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"hughsk","name":"flat","platforms":[],"versions":[{"version":"0","status":"affected","lessThanOrEqual":"6.0.1","versionType":"custom"}],"defaultStatus":"unaffected","packageURL":"pkg:npm/flat","packageIdentity":{"ecosystem":"npm","name":"flat"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-119051"}],"remediation":[],"references":["https://github.com/hughsk/flat/issues/195","https://github.com/hughsk/flat","https://github.com/hughsk/flat/blob/1d68e1d06c0210cff31e5c61ac177f3e2d3fa564/index.js#L65-L75","https://github.com/hughsk/flat/blob/1d68e1d06c0210cff31e5c61ac177f3e2d3fa564/index.js#L137-L142","https://www.vulncheck.com/advisories/flat-through-6.0.1-denial-of-service-via-unflatten-numeric-array-index-keys"],"sources":[{"name":"CVE","id":"CVE-2026-119051","modified":"2026-10-29T13:08:52.215Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-119051"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.2},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9}],"sourceAffected":[],"observedAt":"2026-10-29T14:14:05.219Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T09:15:31.262Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":{"text":"flat through 6.0.1 has a denial of service vulnerability via unflatten() due to uncontrolled resource allocation, allowing attackers to create huge sparse arrays. Attackers can supply specific flattened keys, blocking the Node.js event loop.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:15:01.103Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-119051"}]}}