{"id":"CVE-2026-90776","title":"Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments","summary":"Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separ…","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 >= 9.1.0 < 10.0.5"],"published":"2026-09-13","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:42.833","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90776","references":[{"url":"https://github.com/nodemailer/nodemailer","label":"disclosure@vulncheck.com"},{"url":"https://github.com/nodemailer/nodemailer/blob/v10.0.4/src/addressparser/index.ts#L251","label":"disclosure@vulncheck.com"},{"url":"https://github.com/nodemailer/nodemailer/commit/c07f17518d25aca8ab2ad66968dcbca538c24b89","label":"disclosure@vulncheck.com"},{"url":"https://github.com/nodemailer/nodemailer/releases/tag/v10.0.5","label":"disclosure@vulncheck.com"},{"url":"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-prgh-xp8r-p3m5","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/nodemailer-9.1.0-through-10.0.4-denial-of-service-via-quadratic-address-parsing","label":"disclosure@vulncheck.com"},{"url":"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-prgh-xp8r-p3m5","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90776.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90776"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532697"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90776"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90776"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"epss":0.00479,"epssPercentile":0.40355,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-16T14:04:25.782469Z"},"ingestedAt":"2026-09-14T15:23:07.470Z","slug":"CVE-2026-90776","body":"## Overview\n\nNodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separated atoms to consume excessive CPU and block the Node.js event loop for several seconds, causing denial of service.\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: Self-service automation portal 2 · no fix planned: Self-service automation portal 2 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90776.json)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":205308,"id":"CVE-2026-90776","ts":1789570707956,"field":"exploit_available","old":"false","new":"true"}]}