CVE catalog

CVE-2026-110871

Nodemailer 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

[CVE catalog]

Severity: High · CVSS 7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Oct 14, 2026, 10:52:59 PM UTC
Updated: Oct 14, 2026, 11:17:28 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.38% · Oct 25, 2026

Nodemailer 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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	node-nodemailer	sid	`10.1.7+~8.0.2-1`	fixed
Debian	node-nodemailer	forky	`10.0.14+~8.0.2-1`	fixed
Debian	node-nodemailer	trixie	`6.10.0+~6.4.17-1+deb13u1`	vulnerable
Debian	node-nodemailer	bookworm	`6.8.0+~6.4.6-1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	node-nodemailer	source	sid	`10.0.10+~8.0.1-1`	not yet assigned	Not reported	Not reported
Debian	node-nodemailer	source	forky	`10.0.10+~8.0.1-1`	not yet assigned	Not reported	Not reported
Debian	node-nodemailer	source	trixie	`(unfixed)`	not yet assigned	Not reported	Not reported
Debian	node-nodemailer	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported

Notes

[trixie] node-nodemailer: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[node-nodemailer]Affected
Details (2)
- 6.8.0+~6.4.6-1 · all · bookworm
  Affected
  nvd · node-nodemailer · debian · bookworm; nvd · node-nodemailer · debian · 12
- 6.8.0+~6.4.6-1 · all · bookworm
  Affected
  nvd · node-nodemailer · debian · bookworm; nvd · node-nodemailer · debian · 12

[Debian 13 (Trixie)]

[node-nodemailer]Affected
Details (2)
- 6.10.0+~6.4.17-1+deb13u1 · all · trixie
  Affected
  nvd · node-nodemailer · debian · 13
- 6.10.0+~6.4.17-1+deb13u1 · all · trixie
  Affected
  nvd · node-nodemailer · debian · 13

Observed: Oct 24, 2026, 2:51:12 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]