{"schema":"threatline.record/2","record":{"id":"CVE-2026-110869","aliases":["GHSA-4ffr-jq9g-5ffx"],"summary":"Nodemailer 3.0.0 before 10.0.13 ReDoS via SMTP AUTH Mechanism Detection Regexes","details":"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.","categories":["Unclassified"],"product":"nodemailer","vendor":"nodemailer","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-110869","source_modified_at":"2026-10-15T15:35:29.075Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"nodemailer","vendor":"nodemailer","versions":[{"version":"3.0.0","status":"affected","versionType":"semver","lessThan":"10.0.13"},{"version":"10.0.13","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-110869","source_modified_at":"2026-10-15T15:35:29.075Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"nodemailer","ecosystem":null},"version":"10.0.13","basis":"first unaffected version stated in the CVE record"}],"cvss":8.7,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00305,"percentile":0.22059,"score_date":"2026-10-23"},"published_at":"2026-10-14T22:52:57.866Z","modified_at":"2026-10-15T15:35:29.075Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-110869","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-15T15:35:29.075Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-110869","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/nodemailer/nodemailer/security/advisories/GHSA-4ffr-jq9g-5ffx","tags":["exploit"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/nodemailer-3.0.0-before-10.0.13-redos-via-smtp-auth-mechanism-detection-regexes","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-15T15:35:06.757255Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-15T15:35:29.075Z","content_hash":"6217c35c98575910e5fa021239bdd31f7ef833927d9784f18743eb5d0c5aaa33"}}