{"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","CWE-1333"],"vendor":"nodemailer","product":"nodemailer","affected":["nodemailer < 10.0.6"],"published":"2026-09-26","updated":"2026-09-30","sourceUpdated":"2026-09-30T16:32:17.940","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"},{"url":"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-v53p-9fqp-m79j","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100700.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-100700"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541883"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-100700"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100700"}],"tags":["nvd","cve.org","csaf","vex","red-hat","exploit-available"],"epss":0.00337,"epssPercentile":0.26947,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-28T15:00:18.660649Z"},"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.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Developer Hub · no fix planned: Red Hat Developer Hub · updated 2026-10-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100700.json)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":212020,"id":"CVE-2026-100700","ts":1790612181538,"field":"exploit_available","old":"false","new":"true"}]}