CVE-2026-125755 Nodemailer 3.0.0 before 10.4.1 Recipient Allow-List Bypass via addressparser
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-125755?
CVE-2026-125755 is a high-severity vulnerability in nodemailer, published on 10 Nov 2026.
Official description
Nodemailer 3.0.0 before 10.4.1 contains an address parsing flaw in addressparser that truncates domains at folding whitespace or comments before a dot, allowing attackers to bypass recipient domain restrictions. Attackers can submit crafted to, cc, bcc or replyTo addresses that pass RFC 5322 domain checks but deliver mail to an attacker-chosen address under the application's sender identity.
Weakness: CWE-436
Which versions are affected by CVE-2026-125755?
How do I fix CVE-2026-125755?
Upgrade to a fixed version.
Is CVE-2026-125755 being exploited?
There is no known exploitation of CVE-2026-125755 in the wild and no public exploit code.
Sources
Also known as CLSA-2026-1794329057, CLSA-2026-1794334703, CLSA-2026-1794464097, GHSA-3q53-mvfw-q9v8, GHSA-j5rx-43mx-fv6c, UBUNTU-CVE-2026-125755.