CVE-2026-34580

A flaw was found in Botan, a C++ cryptography library. Due to a misleading function name and an assumption in path validation logic, an end entity certificate could be incorrectly accepted as a trusted root. This occurs when the end entity certificate's Distinguished Name DN and Subject Key...

UBUNTU-CVE-2026-33810

When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the...

CVE-2026-33810

CVE-2026-33810 affects the Go crypto/x509 certificate chain validation. The issue occurs when verifying a chain with excluded DNS constraints: constraints are not consistently applied to wildcard DNS SANs if the SANs’ case differs from the constraint, which can affect validation of otherwise trus...

CVE-2026-33810 Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509

When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the...

EUVD-2026-19968

Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer overflow on 32 bit platforms. Impact summary: A heap buffer overflow may lead to a crash or possibly an attacker controlled code execution or other undefined behavior. If an attacker c...

ALPINE-CVE-2026-31789

Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer overflow on 32 bit platforms. Impact summary: A heap buffer overflow may lead to a crash or possibly an attacker controlled code execution or other undefined behavior. If an attacker c...

DEBIAN-CVE-2026-31789

Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer overflow on 32 bit platforms. Impact summary: A heap buffer overflow may lead to a crash or possibly an attacker controlled code execution or other undefined behavior. If an attacker c...

Improper Certificate Validation

Overview Affected versions of this package are vulnerable to Improper Certificate Validation due to improper validation in the certificateknown function. An attacker can bypass certificate trust verification by presenting an end entity certificate with a distinguished name and subject key...

CVE-2026-31789

OpenSSL vulnerability CVE-2026-31789: on 32-bit platforms, converting a large OCTET STRING (e.g., SKID/AKID in X.509 certificates) to hex can overflow the buffer, causing a heap overflow that may crash or enable attacker-controlled behavior. Affected are OpenSSL versions with the vulnerable conve...

CVE-2026-31789 Heap Buffer Overflow in Hexadecimal Conversion

Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer overflow on 32 bit platforms. Impact summary: A heap buffer overflow may lead to a crash or possibly an attacker controlled code execution or other undefined behavior. If an attacker c...

CVE-2026-31789 Heap Buffer Overflow in Hexadecimal Conversion

Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer overflow on 32 bit platforms. Impact summary: A heap buffer overflow may lead to a crash or possibly an attacker controlled code execution or other undefined behavior. If an attacker c...

CVE-2026-31789

Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer overflow on 32 bit platforms. Impact summary: A heap buffer overflow may lead to a crash or possibly an attacker controlled code execution or other undefined behavior. If an attacker c...

CVE-2026-34580

Botan is a C++ cryptography library. In 3.11.0, the function CertificateStore::certificateknown had a misleading name; it would return true if any certificate in the store had a DN and subject key identifier, if set matching that of the argument. It did not check that the cert it found and the ce...

CVE-2026-34580

Botan is a C++ cryptography library. In 3.11.0, the function CertificateStore::certificateknown had a misleading name; it would return true if any certificate in the store had a DN and subject key identifier, if set matching that of the argument. It did not check that the cert it found and the ce...

CVE-2026-34580

CVE-2026-34580 affects Botan 3.11.0, where Certificate_Store::certificate_known could misidentify certificates during path validation. The function returned true when the DN (and subject key identifier, if set) matched the argument, without verifying the certificates were identical. A later path-...

gnutls: GnuTLS: Denial of Service via excessive resource consumption during certificate verification

A flaw was found in GnuTLS. This vulnerability allows a denial of service DoS by excessive CPU Central Processing Unit and memory consumption via specially crafted malicious certificates containing a large number of name constraints and subject alternative names SANs...

gnutls: GnuTLS: Denial of Service via excessive resource consumption during certificate verification

A flaw was found in GnuTLS. This vulnerability allows a denial of service DoS by excessive CPU Central Processing Unit and memory consumption via specially crafted malicious certificates containing a large number of name constraints and subject alternative names SANs...

PT-2026-31027

Name of the Vulnerable Software and Affected Versions Botan versions prior to 3.11.1 Description The Botan cryptography library contains a flaw in the Certificate Store::certificate known function. This function incorrectly identifies certificates, returning true if any certificate in the store h...

UBUNTU-CVE-2026-31789

Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer overflow on 32 bit platforms. Impact summary: A heap buffer overflow may lead to a crash or possibly an attacker controlled code execution or other undefined behavior. If an attacker c...

PT-2026-31040

Name of the Vulnerable Software and Affected Versions OpenSSL affected versions not specified Description Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer overflow on 32-bit platforms. This occurs when a crafted X.509 certificate contains an...