{"id":"CVE-2026-100700","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-100700","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…","details":"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 whitespace-free runs to block the Node.js event loop for tens of seconds, causing service unavailability.","published":"2026-09-26T14:16:55.007","modified":"2026-09-26T14:16:55.007","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-v53p-9fqp-m79j"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/nodemailer-before-10.0.6-denial-of-service-via-addressparser"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-26T14:16:55.007"}}