CVE-2026-110871

NameCVE-2026-110871
DescriptionNodemailer from 3.0.0 before 10.0.10 contains a denial of service vulnerability in MessageParser.parseHeaders that allows users to exhaust CPU through quadratic header unfolding. Attackers can supply large recipient lists or long headers that fold into tens of thousands of continuation lines, blocking the Node.js event loop during DKIM signing.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
node-nodemailer (PTS)bookworm6.8.0+~6.4.6-1vulnerable
trixie6.10.0+~6.4.17-1+deb13u1vulnerable
forky, sid10.0.14+~8.0.2-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
node-nodemailersource(unstable)10.0.10+~8.0.1-1

Notes

https://github.com/nodemailer/nodemailer/security/advisories/GHSA-39m8-27wv-hr27

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