{"id":"CVE-2026-110869","revision":"890282042fd646f8be194bb59d0f10d8","records":[{"revision":"890282042fd646f8be194bb59d0f10d8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-110869","aliases":[],"title":"Nodemailer 3.0.0 before 10.0.13 ReDoS via SMTP AUTH Mechanism Detection Regexes","description":"Nodemailer 3.0.0 before 10.0.13 has a regular expression denial of service in SMTPConnection._actionEHLO, whose four AUTH mechanism detection regexes contain overlapping whitespace sub-patterns that backtrack quadratically. A malicious or man-in-the-middle SMTP server can reply to EHLO with 250-AUTH, a long whitespace run and a non-matching token, blocking the Node.js event loop for tens of seconds to hours before authentication.","state":0,"publishedAt":"2026-10-14T22:52:57.866+00:00","modifiedAt":"2026-10-15T15:35:29.075+00:00","affected":[{"ecosystem":"Vendor product","name":"nodemailer","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"nodemailer\",\n                    \"product\": \"nodemailer\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:npm/nodemailer\",\n                    \"versions\": [\n                        {\n                            \"version\": \"3.0.0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"10.0.13\"\n                        },\n                        {\n                            \"version\": \"10.0.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/nodemailer/nodemailer/security/advisories/GHSA-4ffr-jq9g-5ffx","https://www.vulncheck.com/advisories/nodemailer-3.0.0-before-10.0.13-redos-via-smtp-auth-mechanism-detection-regexes"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-110869","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-110869","identifiers":["CVE-2026-110869"]},"retained":false,"historicalAffected":[]}],"coverage":[]}