Medium severity · published Sep 26, 2026
CVE-2026-100702
Nodemailer before 10.0.2 Stack Exhaustion via Nested Recipient Arrays
5.9
CVSS
0.2%
EPSS
No
On KEV
Description
Nodemailer before 10.0.2 fails to properly flatten deeply nested arrays in recipient fields such as to, cc, and bcc, allowing attackers to cause stack exhaustion. Attackers can supply a deeply nested JSON recipient array that triggers recursive Array.toString() conversion, exhausting the call stack and terminating the Node.js process.
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)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NO
nodemailer · nodemailer
before 10.0.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100702
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100702
github.com
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-8vvx-rff5-p5rq
www.vulncheck.com
https://www.vulncheck.com/advisories/nodemailer-before-10.0.2-stack-exhaustion-via-nested-recipient-arrays
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