CVE-2026-110869: high-severity vulnerability in nodemailer
Nodemailer 3.0.0 before 10.0.13 ReDoS via SMTP AUTH Mechanism Detection Regexes
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.4%
Nodemailer 3.0.0 before 10.0.13 has a regular expression denial of service in SMTPConnection._actionEHLO, whose four AUTH mechanism detection regexes contain overlapping whitespace sub-patterns that backtrack quadratically. A malicious or man-in-the-middle SMTP server can reply to EHLO with 250-AUTH, a long whitespace run and a non-matching token, blocking the Node.js event loop for tens of seconds to hours before authentication.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
nodemailer · nodemailerRelated CVEs — nodemailer
In the same product, most dangerous first.
CVE-2026-82854CRITICALNodemailer before 8.0.4 SMTP Command Injection via envelope.sizeEPSS 2.0%CVE-2026-82853MEDIUMNodemailer before 8.0.5 SMTP Command Injection via CRLFEPSS 1.0%CVE-2026-92596HIGHNodemailer before 9.1.0 Denial of Service via addressparserEPSS 0.8%CVE-2026-90776HIGHNodemailer 9.1.0 through 10.0.4 Denial of Service via Quadratic Address ParsingEPSS 0.7%CVE-2025-14874HIGHNodemailer: nodemailer: denial of service via crafted email address headerEPSS 0.6%CVE-2025-13033HIGHNodemailer: nodemailer: email to an unintended domain can occur due to interpretation conflictEPSS 0.6%