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CVE-2026-93304 is an authentication bypass in wolfSSL TLS 1.2 and DTLS 1.2 clients affecting versions 4.7.0 through 5.9.2. The client accepts a ChangeCipherSpec record before sending ClientKeyExchange, before a master secret has been derived. It consequently installs read keys derived from a deterministic known key and verifies the server Finished message using that key. An attacker can send the out-of-order record, complete the handshake while impersonating the server, and cause the client to accept attacker-supplied data as authentic. DTLS 1.2 clients are exposed when an out-of-order record is delivered in a datagram. TLS 1.2 clients are exposed when received bytes are supplied through wolfSSL_inject() or read-ahead is enabled.
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Medium-severity wolfSSL ChangeCipherSpec bypass involving an out-of-order ChangeCipherSpec message in TLS 1.2 and DTLS 1.2.
Medium-severity wolfSSL ChangeCipherSpec bypass involving out-of-order ChangeCipherSpec messages in TLS 1.2 and DTLS 1.2.
An authentication-bypass vulnerability in wolfSSL TLS 1.2 and DTLS 1.2 clients. An attacker can send an out-of-order ChangeCipherSpec before ClientKeyExchange, causing the client to use deterministic read keys and accept attacker-controlled handshake completion and application data as authentic. Certificate-based suites require a man-in-the-middle position; PSK connections can be impersonated by any fake server without knowledge of the PSK.
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Cross-references every affected SKU, including bundled OEM variants.
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