High severity · published Sep 16, 2026
CVE-2026-92596
Nodemailer before 9.1.0 Denial of Service via addressparser
7.5
CVSS
0.8%
EPSS
No
On KEV
Description
Nodemailer before 9.1.0 contains a quadratic time complexity vulnerability in the addressparser component that allows remote attackers to cause denial of service by supplying a crafted comma-separated address list. Attackers can send a single email with a large number of addresses to block the Node.js event loop for extended periods, consuming 100% CPU and freezing the process.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NO
nodemailer · nodemailer
before 9.1.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-92596
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-92596
github.com
https://github.com/nodemailer/nodemailer/commit/34da642
github.com
https://github.com/nodemailer/nodemailer/commit/7cc38af
github.com
https://github.com/nodemailer/nodemailer/commit/83b8c48
github.com
https://github.com/nodemailer/nodemailer/commit/9116da9
github.com
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-2x7j-588g-ccc2
www.vulncheck.com
https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-denial-of-service-via-addressparser
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