EUVD-2026-95113

A hostname verification bypass in GnuTLS v3.8.13 allows attackers to circumvent the Common Name fallback mechanism and eavesdrop on communications via a crafted certificate...

PT-2026-108051

A hostname verification bypass in GnuTLS v3.8.13 allows attackers to circumvent the Common Name fallback mechanism and eavesdrop on communications via a crafted certificate...

CVE-2026-85088

A flaw was found in Apache Thrift. During Transport Layer Security TLS certificate validation, the client libraries improperly evaluate the certificate's Common Name CN when subject alternative name SAN entries do not match the target host. A network-positioned attacker possessing a trusted...

Improper Certificate Validation

Overview Affected versions of this package are vulnerable to Improper Certificate Validation via improper evaluation of the certificate's Common Name during TLS certificate validation when subject alternative name entries do not match the target host. An attacker can intercept or tamper with...

PT-2026-104289

Name of the Vulnerable Software and Affected Versions Apache Thrift C++ library versions 0.7.0 through 0.24.0 Apache Thrift D library versions 0.9.0 through 0.24.0 Description Improper validation of certificates with host mismatches occurs in the C++ and D libraries. The default access manager fo...

thrift: thrift: Man-in-the-middle attacks via improper certificate validation

A flaw was found in Apache Thrift. During Transport Layer Security TLS certificate validation, the client libraries improperly evaluate the certificate's Common Name CN when subject alternative name SAN entries do not match the target host. A network-positioned attacker possessing a trusted...

PT-2026-105148

PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN w...

PT-2026-105118

PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN w...

SUSE CVE-2026-91769

PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN w...

CVE-2026-91769

A flaw was found in PHP. This vulnerability allows server impersonation and potential information disclosure during Transport Layer Security TLS connections. When verifying peer certificates, PHP improperly falls back to matching the Common Name CN if no Subject Alternative Name SAN matches the...

PT-2026-99510

Name of the Vulnerable Software and Affected Versions wolfSSL version 5.9.2 Description A flaw exists where a certificate containing a Subject Alternative Name SAN other than a dNSName such as registeredID or iPAddress, but lacking a dNSName SAN, can bypass the Subject Common Name CN dNSName...

DEBIAN-CVE-2026-91769

PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN w...

UBUNTU-CVE-2026-91769

PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN w...

CVE-2026-91769 TLS Hostname Verification Falls Back to CN After SAN Mismatch

PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN w...

EUVD-2026-87346

PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN w...

CVE-2026-91769

A flaw exists in PHP 's OpenSSL stream peer verification where the system improperly falls back to the Common Name (CN) if no Subject Alternative Name (SAN) matches the requested hostname. This violates RFC 6125 , as the CN should be ignored when service identities are present. An attacker could ...

CVE-2026-91769

PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN w...

CVE-2026-91769

PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN w...

PT-2026-98288

Name of the Vulnerable Software and Affected Versions PHP affected versions not specified Description OpenSSL stream peer verification incorrectly handles certificate validation by falling back to the Common Name CN when no entries in the subjectAltName SAN match. According to RFC 6125, the CN...

php: php: Server impersonation via Common Name fallback in TLS verification

A flaw was found in PHP. This vulnerability allows server impersonation and potential information disclosure during Transport Layer Security TLS connections. When verifying peer certificates, PHP improperly falls back to matching the Common Name CN if no Subject Alternative Name SAN matches the...