{"id":"CVE-2026-118678","aliases":[],"cve":{"records":[{"id":"CVE-2026-118678","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-28T17:28:46.441Z","published":"2026-10-28T18:59:50.449Z","modified":"2026-10-29T20:54:29.021Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-10-28T18:59:50.449Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T20:54:29.021Z"}],"references":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-fvv4-gmv9-xqf5","tags":["vendor-advisory"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/n8n-before-2.41.4-and-2.42.1-prototype-pollution-dos-via-workflow-history-compaction","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-1321","description":"Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:*","versionEndExcluding":"2.41.4"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:*","versionStartIncluding":"2.42.0","versionEndExcluding":"2.42.1"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-29T15:28:50.969331Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"partial"}]}]},"title":"n8n before 2.41.4 and 2.42.1 Prototype Pollution DoS via Workflow History Compaction","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution vulnerability that allows low-privileged users to alter built-in object behaviour by saving workflows with specially named connection keys. Attackers can add keys such as __proto__ to workflow connections, which the periodic history compaction task processes, causing logins and writes to fail with server errors.","score":7.1,"severity":"high","published":"2026-10-28T18:59:50.449Z","modified":"2026-10-29T20:54:29.021Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"n8n-io","name":"n8n","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"2.41.4","versionType":"semver"},{"version":"2.41.4","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:npm/n8n","packageIdentity":{"ecosystem":"npm","name":"n8n"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-118678"},{"vendor":"n8n-io","name":"n8n","platforms":[],"versions":[{"version":"2.42.0","status":"affected","lessThan":"2.42.1","versionType":"semver"},{"version":"2.42.1","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:npm/n8n","packageIdentity":{"ecosystem":"npm","name":"n8n"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-118678"}],"remediation":[],"references":["https://github.com/n8n-io/n8n/security/advisories/GHSA-fvv4-gmv9-xqf5","https://www.vulncheck.com/advisories/n8n-before-2.41.4-and-2.42.1-prototype-pollution-dos-via-workflow-history-compaction"],"sources":[{"name":"CVE","id":"CVE-2026-118678","modified":"2026-10-29T20:54:29.021Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-118678"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","score":7.1},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","score":7.1}],"sourceAffected":[],"observedAt":"2026-10-29T21:32:44.505Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T06:55:30.992Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-30T01:55:39.730Z","attemptedAt":"2026-10-30T01:55:39.730Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-30T01:55:38.922Z","attemptedAt":"2026-10-30T01:55:38.922Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-30T01:55:41.267Z","attemptedAt":"2026-10-30T01:55:41.267Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-30T01:55:40.613Z","attemptedAt":"2026-10-30T01:55:40.613Z"}],"evidence":[{"source":"GitHub Advisory Database","id":"GHSA-4v4v-jr32-r382","url":"https://github.com/advisories/GHSA-4v4v-jr32-r382","modified":"2026-10-28T21:31:25Z","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","checkedAt":"2026-10-30T01:55:38.922Z"},{"source":"NVD","id":"CVE-2026-118678","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118678","modified":"2026-10-29T21:17:16.370","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/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":"2026-10-30T01:55:39.730Z"},{"source":"NVD","id":"CVE-2026-118678","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118678","modified":"2026-10-29T21:17:16.370","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","checkedAt":"2026-10-30T01:55:39.730Z"},{"source":"FIRST EPSS","id":"CVE-2026-118678","url":"https://www.first.org/epss/","probability":0.00293,"percentile":0.21927,"date":"2026-10-29","checkedAt":"2026-10-30T01:55:40.613Z"},{"source":"ENISA EUVD","id":"EUVD-2026-112384","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-112384","modified":"Oct 29, 2026, 8:54:29 PM","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","checkedAt":"2026-10-30T01:55:41.267Z"}],"aiSummary":{"text":"n8n versions before 2.41.4 and 2.42.x before 2.42.1 have a prototype pollution vulnerability, allowing low-privileged users to alter built-in object behavior. Attackers can cause server errors by adding specially named connection keys. This affects logins and writes.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:42:11.050Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-118678"}]}}