Medium severity · published Oct 14, 2026
CVE-2026-110870
Nodemailer before 10.0.13 Improper Input Validation via Angle-Bracket Address Comments
5.3
CVSS
0.3%
EPSS
No
On KEV
Description
Nodemailer from 3.0.0 before 10.0.13 contains an improper input validation vulnerability in its address parser that fails to strip RFC 5322 comments inside angle-bracket addresses. Attackers can supply recipients like a display name with a parenthesized comment in the domain, so illegal characters reach envelope.to and RCPT TO, causing rejected delivery or parser interpretation conflicts that bypass domain allow-lists.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% 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 10.0.13 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-110870
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-110870
github.com
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-g73g-hqqh-jr95
www.vulncheck.com
https://www.vulncheck.com/advisories/nodemailer-before-10.0.13-improper-input-validation-via-angle-bracket-address-comments
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