{"id":"CVE-2026-110872","title":"Nodemailer from 3.0.0 before 10.0.10 contains a quadratic complexity denial of service vulnerability in the SMTP client reply parser in SMTPConnection._onData and isPartialResponse","summary":"Nodemailer from 3.0.0 before 10.0.10 contains a quadratic complexity denial of service vulnerability in the SMTP client reply parser in SMTPConnection._onData and isPartialResponse. A malicious SMTP server or on-path attacker can stream …","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-400","CWE-1322"],"vendor":"nodemailer","product":"nodemailer","affected":["nodemailer >= 3.0.0 < 10.0.10"],"published":"2026-10-14","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:14:51.460","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-110872","references":[{"url":"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-4g23-2xm8-66gc","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/nodemailer-3.0.0-before-10.0.10-denial-of-service-via-smtp-reply-parsing","label":"disclosure@vulncheck.com"},{"url":"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-4g23-2xm8-66gc","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110872.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-110872"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2552972"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-110872"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-110872"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"epss":0.00355,"epssPercentile":0.28996,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-15T13:29:48.697322Z"},"ingestedAt":"2026-10-15T00:02:07.190Z","slug":"CVE-2026-110872","body":"## Overview\n\nNodemailer from 3.0.0 before 10.0.10 contains a quadratic complexity denial of service vulnerability in the SMTP client reply parser in SMTPConnection._onData and isPartialResponse. A malicious SMTP server or on-path attacker can stream continuation lines without a completion line before authentication, blocking the Node.js event loop and exhausting memory.\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** · Moderate · affected: Red Hat Developer Hub, Red Hat Enterprise Linux 10, Self-service automation portal 2 · no fix planned: Red Hat Developer Hub, Red Hat Enterprise Linux 10, Self-service automation portal 2 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110872.json)","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":222376,"id":"CVE-2026-110872","ts":1792073319421,"field":"exploit_available","old":"false","new":"true"}]}