{"action":"Upgrade n8n to 1.123.32 or later.","affected":[{"fixed":"1.123.32","introduced":"0"},{"fixed":"2.18.1","introduced":"2.18.0"},{"fixed":"2.17.4","introduced":"2.0.0"}],"component":"n8n","cve_ids":["CVE-2026-42236"],"ecosystem":"npm","epss":0.00487,"exploited":false,"fixed_versions":["1.123.32","2.18.1","2.17.4"],"ghsa_id":"GHSA-49m9-pgww-9vq6","id":"tcs_01M5KEZYN5ZMJ0DEM4EKG4B94Y","modified_at":"2026-05-08T01:51:06.134658Z","published_at":"2026-04-29T21:19:07Z","references":["https://osv.dev/vulnerability/GHSA-49m9-pgww-9vq6","https://github.com/n8n-io/n8n/security/advisories/GHSA-49m9-pgww-9vq6","https://nvd.nist.gov/vuln/detail/CVE-2026-42236","https://github.com/n8n-io/n8n"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-49m9-pgww-9vq6","url":"https://osv.dev/vulnerability/GHSA-49m9-pgww-9vq6"}],"summary":"n8n Vulnerable to Unauthenticated Denial of Service via MCP Client Registration"}