Nodemailer: Process-global DNS cache reuses TLS `servername` across transports, enabling cross-tenant SMTP credential disclosure

Summary Nodemailer's process-global DNS cache is keyed only by host, but each cache entry also stores the caller-specific TLS servername. When two direct SMTPS transports use the same DNS host with different tls.servername values, the first transport's server name is returned to the second...

NPM: Nodemailer: Process-global DNS cache reuses TLS `servername` across transports, enabling cross-tenant SMTP credential disclosure

NPM: Nodemailer: Process-global DNS cache reuses TLS servername across transports, enabling cross-tenant SMTP credential disclosure vulnerability discovered by ? in WordPress Npm nodemailer versions = 5.0.0, 10.0.2...

GHSA-6VJ9-MWQ6-2F5V Nodemailer: Process-global DNS cache reuses TLS `servername` across transports, enabling cross-tenant SMTP credential disclosure

Summary Nodemailer's process-global DNS cache is keyed only by host, but each cache entry also stores the caller-specific TLS servername. When two direct SMTPS transports use the same DNS host with different tls.servername values, the first transport's server name is returned to the second...

DEBIAN-CVE-2026-100701

Nodemailer versions 5.0.0 through 10.0.1 use a process-global DNS cache that is keyed only by the DNS host, while each cache entry also stores the caller-specific TLS servername. When two direct TLS/SMTPS transports secure: true resolve the same non-IP host with different tls.servername values, t...

CVE-2026-100701 Nodemailer 5.0.0 through 10.0.1 TLS servername Cache Confusion

Nodemailer versions 5.0.0 through 10.0.1 use a process-global DNS cache that is keyed only by the DNS host, while each cache entry also stores the caller-specific TLS servername. When two direct TLS/SMTPS transports secure: true resolve the same non-IP host with different tls.servername values, t...

CVE-2026-100701 Nodemailer 5.0.0 through 10.0.1 TLS servername Cache Confusion

Nodemailer versions 5.0.0 through 10.0.1 use a process-global DNS cache that is keyed only by the DNS host, while each cache entry also stores the caller-specific TLS servername. When two direct TLS/SMTPS transports secure: true resolve the same non-IP host with different tls.servername values, t...

EUVD-2026-87674

Nodemailer versions 5.0.0 through 10.0.1 use a process-global DNS cache that is keyed only by the DNS host, while each cache entry also stores the caller-specific TLS servername. When two direct TLS/SMTPS transports secure: true resolve the same non-IP host with different tls.servername values, t...

CVE-2026-100701 Nodemailer 5.0.0 through 10.0.1 TLS servername Cache Confusion

Nodemailer versions 5.0.0 through 10.0.1 use a process-global DNS cache that is keyed only by the DNS host, while each cache entry also stores the caller-specific TLS servername. When two direct TLS/SMTPS transports secure: true resolve the same non-IP host with different tls.servername values, t...

EulerOS 2.0 SP15 : pyOpenSSL (EulerOS-SA-2026-2458)

According to the versions of the pyOpenSSL packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback t...

Security Bulletin: pyOpenSSL TLS SNI Callback Exception Handling Flaw Allows Security Bypass

Summary pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to settlsextservernamecallback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this...

AZL-80031 CVE-2026-27448 affecting package pyOpenSSL for versions less than 24.2.1-2

pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to settlsextservernamecallback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for...