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Advisory record · GHSA-8c8m-p3m8-cjg8

Nodemailer: A nested comment ends early in addressparser, releasing the rest of the comment as a recipient

CVSS 8.3 HighEPSS 0.0034 · 27th percentile

Published by the GitHub Advisory Database at 23 Oct 2026, 21:53 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
nodemailernpm>=3.0.0, <10.1.410.1.4
Identifiers
GHSA-8c8m-p3m8-cjg8 · CVE-2026-121424
Weakness (CWE)
CWE-20 · CWE-436
Tags
Published
23 Oct 2026
Updated
4 Nov 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Nodemailer, in the addressparser component of the npm nodemailer package, versions 3.0.0 through 10.1.3, misreads nested RFC 5322 comments so that part of an address is treated as a recipient. An attacker who controls the text of an address passed to Nodemailer, or the From or To header of an inbound message parsed with mailparser, can cause mail meant for an approved recipient to be delivered to an attacker-chosen domain, and can make parsers disagree on the author. Upgrade to nodemailer 10.1.4, which contains the fix.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.3 High 4.0 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0034, the 27th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:33 UTC First seen by agentprime
  2. 31 Oct 2026, 13:33 UTC Confirmed by OSV
  3. 3 Nov 2026, 14:38 UTC Confirmed by the CVE List
  4. 3 Nov 2026, 15:25 UTC Confirmed by NVD

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.