{"action":"Upgrade n8n to 1.121.3 or later.","affected":[{"fixed":"1.121.3","introduced":"0.123.0"}],"component":"n8n","cve_ids":["CVE-2026-21877"],"ecosystem":"npm","epss":0.05449,"exploited":false,"fixed_versions":["1.121.3"],"ghsa_id":"GHSA-v364-rw7m-3263","id":"tcs_01M5KGAG9MJ5VRXBEY6T5DR48J","modified_at":"2026-02-03T03:16:47.897278Z","published_at":"2026-01-06T17:48:24Z","references":["https://osv.dev/vulnerability/GHSA-v364-rw7m-3263","https://github.com/n8n-io/n8n/security/advisories/GHSA-v364-rw7m-3263","https://github.com/n8n-io/n8n"],"severity":{"label":"critical","score":9.9},"sources":[{"source":"osv","source_id":"GHSA-v364-rw7m-3263","url":"https://osv.dev/vulnerability/GHSA-v364-rw7m-3263"}],"summary":"n8n Vulnerable to RCE via Arbitrary File Write"}