OpenSearch has ineffective TLS certificate hostname verification

Description A regression was introduced in OpenSearch 2.18.0 that caused the plugins.security.ssl.transport.enforcehostnameverification setting to be ineffective. When this setting was enabled, OpenSearch did not verify that the hostname in a connecting node's TLS certificate matched the hostname...

CVE-2026-5188 Integer underflow in X.509 SAN parsing in wolfSSL

An integer underflow issue exists in wolfSSL when parsing the Subject Alternative Name SAN extension of X.509 certificates. A malformed certificate can specify an entry length larger than the enclosing sequence, causing the internal length counter to wrap during parsing. This results in incorrect...

Medium: libcap

Issue Overview: crypto/x509: excluded subdomain constraint does not restrict wildcard SANs An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certificate. For example a constraint that excludes the subdomain test.example.com does not...

CVE-2025-65494

NULL pointer dereference in getsanorcnfromcert in src/coapopenssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted X.509 certificate that causes skGENERALNAMEvalue to return NULL...

SUSE CVE-2009-3639

The modtls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended...

nodejs: Improper handling of URI Subject Alternative Names

A flaw was found in node.js where it accepted a certificate's Subject Alternative Names SAN entry, as opposed to what is specified by the HTTPS protocol. This flaw allows an active person-in-the-middle to forge a certificate and impersonate a trusted host...

GHSA-WC4X-4GM2-74J8 Apache Geode SSL endpoint verification vulnerability

When TLS is enabled with ssl-endpoint-identification-enabled set to true, Apache Geode fails to perform hostname verification of the entries in the certificate SAN during the SSL handshake. This could compromise intra-cluster communication using a man-in-the-middle attack...

Update adds BPA rules for DirectAccess in Windows Server 2012 R2 or Windows Server 2012

Update adds BPA rules for DirectAccess in Windows Server 2012 R2 or Windows Server 2012 Introduction This article describes an update that adds new Best Practices Analyzer BPA rules. The rules are for DirectAccess on the servers that are running Windows Server 2012 R2 or Windows Server 2012. The...

Code injection

When TLS is enabled with ssl-endpoint-identification-enabled set to true, Apache Geode fails to perform hostname verification of the entries in the certificate SAN during the SSL handshake. This could compromise intra-cluster communication using a man-in-the-middle attack...