{"id":"CVE-2026-100700","title":"nodemailer before 10.0.6 contains a denial of service vulnerability in the addressparser free-text fallback regex pattern that exhibits quadratic backtracking behavior","summary":"nodemailer before 10.0.6 contains a denial of service vulnerability in the addressparser free-text fallback regex pattern that exhibits quadratic backtracking behavior. Attackers can supply crafted email header values with long whitespac…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-407"],"vendor":"nodemailer","product":"nodemailer","affected":["nodemailer < 10.0.6"],"published":"2026-09-26","updated":"2026-09-26","sourceUpdated":"2026-09-26T14:16:55.007","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100700","references":[{"url":"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-v53p-9fqp-m79j","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/nodemailer-before-10.0.6-denial-of-service-via-addressparser","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-26T13:33:20.900Z","slug":"CVE-2026-100700","body":"## Overview\n\nnodemailer before 10.0.6 contains a denial of service vulnerability in the addressparser free-text fallback regex pattern that exhibits quadratic backtracking behavior. Attackers can supply crafted email header values with long whitespace-free runs to block the Node.js event loop for tens of seconds, causing service unavailability.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}