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...

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...

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

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...

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 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...

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...

gnutls: Fix of CVE-2026-42012

CVE-2026-42012: URI subjectAltName now precludes Common Name fallback in hostname verification...

Improper Certificate Validation

Bouncy Castle for Java is vulnerable to Improper Certificate Validation. The vulnerability is due to improper hostname verification behavior, which allows an attacker to exploit certificate validation by relying on the certificate’s Common Name CN when the hostname does not properly match the...

CVE-2026-55996

A denial-of-service vulnerability was identified in multiple TLS listeners in Rancher. Both the cattle-cluster-agent component running in downstream clusters and the Rancher server itself use the dynamiclistener library to serve TLS traffic. Without an effective CN filter configured,...

SUSE CVE-2026-66402

FreeRDP before 3.29.0 affected versions = 3.28.0 contains multiple TLS certificate identity validation weaknesses in tlsverifycertificate, tlsmatchhostname, and x509utilsgetdnsnames. Because FreeRDP performs custom Common Name and DNS SAN string matching instead of using OpenSSL's length-aware...

Improper Validation of Certificate with Host Mismatch

Overview Affected versions of this package are vulnerable to Improper Validation of Certificate with Host Mismatch in the HostnameUtil class, whose "match CN when no dNSName SAN exists" fallback is gated on Properties.isOverrideSetJSSEHOSTNAMECHECKCNFALLBACK, true, which returns true when the...

Improper Validation of Certificate with Host Mismatch

Overview Affected versions of this package are vulnerable to Improper Validation of Certificate with Host Mismatch in the HostnameUtil class, whose "match CN when no dNSName SAN exists" fallback is gated on Properties.isOverrideSetJSSEHOSTNAMECHECKCNFALLBACK, true, which returns true when the...

Improper Validation of Certificate with Host Mismatch

Overview Affected versions of this package are vulnerable to Improper Validation of Certificate with Host Mismatch in the HostnameUtil class, whose "match CN when no dNSName SAN exists" fallback is gated on Properties.isOverrideSetJSSEHOSTNAMECHECKCNFALLBACK, true, which returns true when the...

Improper Validation of Certificate with Host Mismatch

Overview Affected versions of this package are vulnerable to Improper Validation of Certificate with Host Mismatch in the HostnameUtil class, whose "match CN when no dNSName SAN exists" fallback is gated on Properties.isOverrideSetJSSEHOSTNAMECHECKCNFALLBACK, true, which returns true when the...