Tls

FreeRDP versions 3.28.0 and earlier are vulnerable to a heap out-of-bounds read during the processing of malicious RDP server glyph fragments, allowing for potential client-side crashes or information disclosure.

An inverted-boolean bug (CVE-2026-46428) in the `lettre` library's `boring-tls` integration silently disables TLS hostname verification for callers using the default strict configuration, allowing an on-path attacker with any chain-valid certificate to intercept SMTP submission, including credentials and message contents, from affected `lettre` clients.

A denial-of-service vulnerability in etcd's TLS listener allows a network attacker to exhaust server memory by spawning unbounded goroutines through multiple TCP connections without sending ClientHello messages, leading to loss of availability for etcd clusters and dependent services like Kubernetes.

A critical vulnerability (CVE-2026-56820) in Netty's `OcspClient` allows a bad actor to bypass certificate revocation checks by replaying a valid OCSP 'GOOD' status response from an unrelated certificate, enabling a certificate validation bypass for any certificate issued by the same Certificate Authority.

Cesanta Mongoose before version 7.22 contains an out-of-bounds read vulnerability (CVE-2026-11404) in its built-in TLS server function, `mg_tls_server_recv_hello()`, allowing a remote, unauthenticated attacker to send a specially crafted TLS ClientHello message with an oversized session ID length, leading to a service crash and denial of service for HTTPS, MQTTS, or WSS services.

The AI Bridge Proxy (`aibridgeproxyd`) in Coder's platform, when running in its default configuration without an upstream proxy, failed to perform TLS certificate verification for outbound HTTPS connections to the Coder server (CVE-2026-55436), allowing an on-path attacker to intercept sensitive data including Coder session tokens, user-supplied API keys, and full request/response bodies.

This rule identifies successful outbound TLS sessions initiated by internal hosts to external destinations that utilize deprecated protocol versions (SSLv3, TLS 1.0, TLS 1.1) or weak cipher suites such as RC4, 3DES, NULL, EXPORT, or anonymous Diffie-Hellman. Such negotiations can indicate an Adversary-in-the-Middle attack or communication with legacy malware, allowing for traffic interception or decryption. Detection engineers should investigate the `source.ip`, `destination.ip`, `tls.version`, and `tls.cipher` to determine if the destination is a legitimate legacy system or a potential compromise, checking for concurrent alerts on the source host.

CVE-2026-42790 is a vulnerability in Microsoft products related to name constraints DNS bypass via subject CommonName fallback in public_key hostname verification.

A vulnerability in Deno's Node.js tls compatibility layer (versions 2.0.0 to 2.7.7) allows a network attacker to intercept and tamper with plaintext application data transmitted over a supposedly TLS-protected connection when `autoSelectFamily` is enabled and the initial connection attempt fails, leading to potential information disclosure and data manipulation.

A remote attacker can trigger a heap overread in libgnutls by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, potentially leading to information disclosure.

CVE-2026-42012 describes a vulnerability in GnuTLS where a remote attacker can spoof legitimate services or intercept sensitive information by presenting a specially crafted certificate with URI or SRV SANs, causing the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN).

IBM HTTP Server 8.5 and 9.0 are vulnerable to remote code execution and denial of service in configurations utilizing TLS mutual authentication (client authentication).

CVE-2025-14575 describes an uncontrolled search path element vulnerability in the Qt Network OpenSSL TLS backend, allowing for the loading of rogue CA certificates, potentially leading to man-in-the-middle attacks.

The epa4all-client library before version 1.2.2 is vulnerable to a TLS certificate validation issue, allowing a man-in-the-middle attacker to intercept SOAP traffic and sensitive patient data by presenting a malicious TLS certificate.

CVE-2026-32283 is a vulnerability in crypto/tls that allows unauthenticated TLS 1.3 KeyUpdate records, leading to persistent connection retention and a denial-of-service condition.

CVE-2026-34073 is a vulnerability in unspecified Microsoft products due to incomplete DNS name constraint enforcement on peer names, potentially leading to certificate validation bypass.

CVE-2026-41898 describes a vulnerability in rust-openssl where unchecked callback-returned length in PSK and cookie generation can cause OpenSSL to leak adjacent memory to a network peer.

Juju controller versions 3.2.0 up to 3.6.20 and 4.0.5 are vulnerable to unauthorized database access due to improper TLS client/server authentication and certificate verification, allowing an attacker with network access to modify all information, escalate privileges, and open firewall ports.

Oxia's `trustedCertPool()` function fails to parse multi-certificate PEM bundles, leading to certificate chain validation failure and rejection of legitimate clients in mTLS deployments.

Mod_gnutls versions prior to 0.12.3 and 0.13.0 are vulnerable to a certificate chain overflow when verifying client certificates, potentially leading to a segfault or stack corruption.

CVE-2026-20004 is a vulnerability in the TLS library of Cisco IOS XE Software that allows an unauthenticated, adjacent attacker to exhaust device memory, leading to denial of service.