{"schema":"threatline.record/2","record":{"id":"CVE-2026-118678","aliases":["GHSA-fvv4-gmv9-xqf5"],"summary":"n8n before 2.41.4 and 2.42.1 Prototype Pollution DoS via Workflow History Compaction","details":"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.","categories":["Frameworks"],"product":"n8n","vendor":"n8n-io","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-118678","source_modified_at":"2026-10-28T18:59:50.449Z","fetched_at":"2026-10-28T20:58:01.013507Z","product":"n8n","vendor":"n8n-io","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"2.41.4"},{"version":"2.41.4","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-118678","source_modified_at":"2026-10-28T18:59:50.449Z","fetched_at":"2026-10-28T20:58:01.013507Z","product":"n8n","vendor":"n8n-io","versions":[{"version":"2.42.0","status":"affected","versionType":"semver","lessThan":"2.42.1"},{"version":"2.42.1","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-118678","source_modified_at":"2026-10-28T18:59:50.449Z","fetched_at":"2026-10-28T20:58:01.013507Z","package":{"name":"n8n","ecosystem":null},"version":"2.41.4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-118678","source_modified_at":"2026-10-28T18:59:50.449Z","fetched_at":"2026-10-28T20:58:01.013507Z","package":{"name":"n8n","ecosystem":null},"version":"2.42.1","basis":"first unaffected version stated in the CVE record"}],"cvss":7.1,"severity":"High","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-28T18:59:50.449Z","modified_at":"2026-10-28T18:59:50.449Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-118678","fetched_at":"2026-10-28T20:58:01.013507Z","source_modified_at":"2026-10-28T18:59:50.449Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-fvv4-gmv9-xqf5","tags":["vendor-advisory"]},{"source":"CVE List","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"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-28T18:59:50.449Z","content_hash":"4e7281e06d85a9a0dc564a06a84fdb3b0b1baf17dadcb43ee4b4a43604223b73"}}