Medium severity · published Oct 14, 2026
CVE-2026-110872
Nodemailer 3.0.0 before 10.0.10 Denial of Service via SMTP Reply Parsing
5.9
CVSS
0.4%
EPSS
No
On KEV
Description
Nodemailer from 3.0.0 before 10.0.10 contains a quadratic complexity denial of service vulnerability in the SMTP client reply parser in SMTPConnection._onData and isPartialResponse. A malicious SMTP server or on-path attacker can stream continuation lines without a completion line before authentication, blocking the Node.js event loop and exhausting memory.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NO
nodemailer · nodemailer
3.0.0 before 10.0.10 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-110872
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-110872
github.com
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-4g23-2xm8-66gc
www.vulncheck.com
https://www.vulncheck.com/advisories/nodemailer-3.0.0-before-10.0.10-denial-of-service-via-smtp-reply-parsing
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