Medium severity · published Aug 31, 2026
CVE-2026-82661
Nodemailer CRLF Injection via List-* Header Comments
5.4
CVSS
0.3%
EPSS
No
On KEV
Description
Nodemailer before 8.0.9 fails to sanitize carriage return and line feed characters in list comment fields, allowing attackers to inject arbitrary message headers. An attacker with control over list.*.comment parameters can inject CRLF sequences to create additional headers in generated RFC822 messages, altering mail client behavior and message semantics.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NO
nodemailer · nodemailer
before 8.0.9 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-82661
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-82661
github.com
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-268h-hp4c-crq3
www.vulncheck.com
https://www.vulncheck.com/advisories/nodemailer-crlf-injection-via-list-header-comments
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