A security issue was found in GnuTLS before version 3.7.1. It was found that the client sending a "key_share" extension may result in dereferencing a pointer no longer valid after realloc(). This only happens in TLS 1.3 and only when the client sends a large Client Hello message, e.g., when HRR is sent in a resumed session previously negotiated large FFDHE parameters, because the initial allocation of the buffer is large enough without having to call realloc().
A security issue was found in GnuTLS before version 3.7.1. It was found that the client sending a "key_share" extension may result in dereferencing a pointer no longer valid after realloc(). This only happens in TLS 1.3 and only when the client sends a large Client Hello message, e.g., when HRR is sent in a resumed session previously negotiated large FFDHE parameters, because the initial allocation of the buffer is large enough without having to call realloc().
https://www.gnutls.org/security-new.html#GNUTLS-SA-2021-03-10 https://gitlab.com/gnutls/gnutls/-/issues/1151 https://gitlab.com/gnutls/gnutls/-/merge_requests/1399 https://gitlab.com/gnutls/gnutls/-/commit/15beb4b193b2714d88107e7dffca781798684e7e
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