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Advisory record · GHSA-g73g-hqqh-jr95

Nodemailer: RFC 5322 comment inside an angle-bracket address is never stripped

CVSS 6.9 MediumEPSS 0.0027 · 18th percentile

Published by the GitHub Advisory Database at 27 Oct 2026, 15:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
nodemailernpm>=3.0.0, <10.0.1310.0.13
Identifiers
GHSA-g73g-hqqh-jr95 · CVE-2026-110870
Weakness (CWE)
CWE-20 · CWE-436
Tags
Published
27 Oct 2026
Updated
27 Oct 2026

Machine-written summary

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

Nodemailer versions 3.0.0 through 10.0.12 do not strip RFC 5322 comments inside angle-bracket recipient addresses such as Name <user@domain>, so malformed characters remain in the address. An application that passes such a recipient to Nodemailer can have the message rejected by a strict SMTP server, and other parsers may read the address differently. Upgrade to 10.0.13, the fixed version.

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
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0027, the 18th 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

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.