static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op)
{
    /* Lookup signature algorithm digest */
    int secbits = -1, md_nid = NID_undef, sig_nid;
    /* Don't check signature if self signed */
    if ((X509_get_extension_flags(x) & EXFLAG_SS) != 0)
        return 1;
    sig_nid = X509_get_signature_nid(x);
    if (sig_nid && OBJ_find_sigid_algs(sig_nid, &md_nid, NULL)) {
        const EVP_MD *md;
        if (md_nid && (md = EVP_get_digestbynid(md_nid)))
            secbits = EVP_MD_size(md) * 4;
    }
    if (s)
        return ssl_security(s, op, secbits, md_nid, x);
    else
        return ssl_ctx_security(ctx, op, secbits, md_nid, x);
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.