{"schemaVersion":3,"id":"CVE-2026-110870","aliases":["DEBIAN-CVE-2026-110870","UBUNTU-CVE-2026-110870"],"status":"published","duplicateOf":null,"title":null,"description":"Nodemailer from 3.0.0 before 10.0.13 contains an improper input validation vulnerability in its address parser that fails to strip RFC 5322 comments inside angle-bracket addresses. Attackers can supply recipients like a display name with a parenthesized comment in the domain, so illegal characters reach envelope.to and RCPT TO, causing rejected delivery or parser interpretation conflicts that bypass domain allow-lists.","dates":{"published":"2026-10-14T22:52:58.787Z","modified":"2026-10-14T22:52:58.787Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.9,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":6.9,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":6.9,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV 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Input Validation","description":"The product receives input or data, but it does\n        not validate or incorrectly validates that the input has the\n        properties that are required to process the data safely and\n        correctly.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/20.html"}],"affected":[{"vendor":"debian","product":"node-nodemailer","name":"node-nodemailer","label":"node-nodemailer","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/node-nodemailer","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 10.0.13+~8.0.2-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 10.0.13+~8.0.2-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"node-nodemailer","name":"node-nodemailer","label":"node-nodemailer","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/node-nodemailer","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"nodemailer","product":"nodemailer","name":"nodemailer","label":"nodemailer","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0, < 10.0.13","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0, < 10.0.13","eol":null,"hubHref":"/vendor/nodemailer/nodemailer"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-g73g-hqqh-jr95","label":"github.com/nodemailer/nodemailer/security/advisories/GHSA-g73g-hqqh-jr95","hostname":"github.com","tags":["Vendor Advisory","REPORT"]},{"url":"https://www.vulncheck.com/advisories/nodemailer-before-10.0.13-improper-input-validation-via-angle-bracket-address-comments","label":"www.vulncheck.com/advisories/…","hostname":"www.vulncheck.com","tags":["Third Party Advisory","REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-110870","label":"security-tracker.debian.org/tracker/CVE-2026-110870","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-110870","label":"ubuntu.com/security/CVE-2026-110870","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-110870","label":"www.cve.org/CVERecord?id=CVE-2026-110870","hostname":"www.cve.org","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-14T22:52:58.787Z","label":"Published","detail":"Vulnerability first 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