{"id":"CVE-2026-21712","title":"A flaw in Node.js URL processing causes an assertion failure in native code when `url.format()` is called with a malformed internationalized domain name (IDN) containing invalid characters, crashing the Node.js process.","summary":"A flaw in Node.js URL processing causes an assertion failure in native code when `url.format()` is called with a malformed internationalized domain name (IDN) containing invalid characters, crashing the Node.js process.","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cwe":["CWE-20"],"vendor":"nodejs","product":"node.js","affected":["node.js >= 24.0.0, <= 24.14.0","node.js >= 25.0.0, <= 25.8.1"],"published":"2026-03-30","updated":"2026-08-19","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-21712","references":[{"url":"https://hackerone.com/reports/3546390","label":"support@hackerone.com"},{"url":"https://nodejs.org/en/blog/vulnerability/march-2026-security-releases","label":"support@hackerone.com"}],"tags":["nvd"],"epss":0.0032,"epssPercentile":0.25066,"ingestedAt":"2026-08-19T14:40:19.027Z","slug":"CVE-2026-21712","body":"## Overview\n\nA flaw in Node.js URL processing causes an assertion failure in native code when `url.format()` is called with a malformed internationalized domain name (IDN) containing invalid characters, crashing the Node.js process.\n\n## Affected\n\n- `node.js >= 24.0.0, <= 24.14.0`\n- `node.js >= 25.0.0, <= 25.8.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}