Node nodemailer: Nodemailer from 3.0.0 before 10.0.10 contains a denial of service vulnerability in
Affects node-nodemailerSource GCVE Database
Not known to be exploited · CVSS 7.1 High · fixed in 10.0.10 : patch node-nodemailer soon.
Data as of 28 Oct 2026, 23:57 UTC
- Patch
- Available – fixed in 10.0.10
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NExploitation evidence
t = 0 is the CVE’s publication on cve.org
Disclosed: evidence found.
CVE published 14 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: evidence found.
CISA SSVC: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
Timeline
CVE ID reserved
by VulnCheck
, 32 minutes before disclosure
CVE published
on cve.org
, t = 0
CISA SSVC assessment
proof of concept public
, 6 days after disclosure
In Threat Radar
record ingested
, 12 days after disclosure
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA SSVC, the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10node-nodemailerpkg:deb/ubuntu/node-nodemailer?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSnode-nodemailerpkg:deb/ubuntu/node-nodemailer?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSnode-nodemailerpkg:deb/ubuntu/node-nodemailer?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 22.04 LTSnode-nodemailerpkg:deb/ubuntu/node-nodemailer?arch=source&distro=jammyOther threats | Affected
| Fixed in– |
Ubuntu 20.04 LTSnode-nodemailerpkg:deb/ubuntu/node-nodemailer?arch=source&distro=focalOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available in Nodemailer version 10.0.10 and later. Users should upgrade to version 10.0.10 or newer to remediate this vulnerability. No other mitigation or temporary workaround is indicated.
Description
Nodemailer versions from 3.0.0 up to but not including 10.0.10 contain a denial of service vulnerability in the MessageParser.parseHeaders function. This flaw allows attackers to exhaust CPU resources by supplying large recipient lists or long headers that unfold into tens of thousands of continuation lines, blocking the Node.js event loop during DKIM signing.
References
- ubuntu.com/security/CVE-2026-110871 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-110871 (opens in a new tab)
- github.com/nodemailer/nodemailer/security/advisories/GHSA-39m8-27wv-hr27 (opens in a new tab)
- vulncheck.com/advisories/nodemailer-3.0.0-before-10.0.10-quadratic-dkim-header-unfolding-denial-of-service (opens in a new tab)