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...

AlmaLinux 9.6 [TuxCare] Security Update: gnutls / gnutls-c++ / gnutls-dane / gnutls-devel / gnutls-utils (ALMALINUX9.6:CLSA-2026:1779827686)

The AlmaLinux 9.6 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1779827686 advisory. - A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of nameConstraints labels,...

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...

Astra Linux – Vulnerability in curl

There is a vulnerability in the handling of certificate validation in curl v8.1.0, particularly in how wildcard patterns are matched when listed as “Subject Alternative Name” in TLS server certificates. Curls can be modified to use its own name matching function for TLS, rather than the one...

CVE-2026-57163: Stack-based Buffer Overflow

PJSIP is a free and open source multimedia communication library written in C. Prior to commit c4a151a, a stack buffer overflow exists in the GnuTLS TLS backend when parsing the Subject Alternative Name extension of a peer certificate tlscertgetinfo in sslsockgtls.c. Only GnuTLS builds are affect...

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-2026-64655 GitHub CLI: Attestation Verification Bypass via Unescaped Regex Metacharacters in SAN Matching

GitHub CLI gh is GitHub’s official command line tool. Prior to 2.97.0, gh attestation verify builds the certificate Subject Alternative Name matcher from the --signer-repo and --signer-workflow flag values without escaping regex metacharacters, so a user-supplied repository or workflow name is...

CVE-2026-64655 GitHub CLI: Attestation Verification Bypass via Unescaped Regex Metacharacters in SAN Matching

GitHub CLI gh is GitHub’s official command line tool. Prior to 2.97.0, gh attestation verify builds the certificate Subject Alternative Name matcher from the --signer-repo and --signer-workflow flag values without escaping regex metacharacters, so a user-supplied repository or workflow name is...

crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries

A flaw was found in the crypto/x509 package of golang. This vulnerability allows a remote attacker to cause a Denial of Service DoS by presenting a specially crafted X.509 certificate with a large number of DNS Subject Alternative Name SAN entries. The certificate verification process, specifical...

EulerOS 2.0 SP13 : gnutls (EulerOS-SA-2026-2966)

According to the versions of the gnutls packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of nameConstraints labels, specifically f...

EulerOS 2.0 SP15 : gnutls (EulerOS-SA-2026-2884)

According to the versions of the gnutls packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of nameConstraints labels, specifically f...

SUSE CVE-2026-69248

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In versions 45.0.0 through 48.0.0, if an intermediate constrained CA permits the DNS name foo.example.com, and the leaf certificate has a wildcard in its DNS SAN of .example.com,...

crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries

A flaw was found in the crypto/x509 package of golang. This vulnerability allows a remote attacker to cause a Denial of Service DoS by presenting a specially crafted X.509 certificate with a large number of DNS Subject Alternative Name SAN entries. The certificate verification process, specifical...

Medium: amazon-cloudwatch-agent

Issue Overview: x509.Certificate.VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name SAN entries. This caused strings.Splithost, "." to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically bas...

DEBIAN-CVE-2026-69248

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In versions 45.0.0 through 48.0.0, if an intermediate constrained CA permits the DNS name foo.example.com, and the leaf certificate has a wildcard in its DNS SAN of .example.com,...

python-cryptography verifier accepts wildcard DNS names allowing escape from permittedSubtrees

Summary If an intermediate constrained CA permits the DNS name foo.example.com, and the leaf certificate has a wildcard in its DNS SAN of .example.com, python-cryptography's verifier accepts which allows escaping outside of the permitted names. PoC !/usr/bin/env python3 """Standalone PoC: pyca's...

CVE-2026-69248 python-cryptography verifier accepts wildcard DNS names allowing escape from permittedSubtrees

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In versions 45.0.0 through 48.0.0, if an intermediate constrained CA permits the DNS name foo.example.com, and the leaf certificate has a wildcard in its DNS SAN of .example.com,...

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...

UBUNTU-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...