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THREAT OPSThreat News › [GHSA] GHSA-2x7j-588g-ccc2 (high) — Nodemailer: Quadratic (O(n²)) time complexity in addressparser allows remote denial of service via a crafted address list

[GHSA] GHSA-2x7j-588g-ccc2 (high) — Nodemailer: Quadratic (O(n²)) time complexity in addressparser allows remote denial of service via a crafted address list

medgithub_advisoriesPublished 2026-09-08

GHSA-2x7j-588g-ccc2 Severity: high CVE: None

Nodemailer: Quadratic (O(n²)) time complexity in addressparser allows remote denial of service via a crafted address list

### Summary

Nodemailer's address parser (`lib/addressparser/index.js`) parses a list of comma‑separated addresses in **quadratic time — O(n²)** in the number of addresses. A single crafted address string (e.g. a `To`, `Cc`, `Bcc`,

Indicators of compromise

Original source: https://github.com/advisories/GHSA-2x7j-588g-ccc2