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    <title>WAF Bypass on 老许的博客</title>
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      <title>Ghost Bits：Black Hat Asia 2026 揭露的 Java Unicode 截断攻击</title>
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      <description>Ghost Bits 是 Black Hat Asia 2026 披露的一种新型攻击手法，利用 Java 中 char（16位）强转为 byte（8位）时高8位被静默丢弃的特性，让 WAF 看到无害的中文字符，而底层执行时变成危险 ASCII 字符，从而绑过 WAF 实现 SQL 注入、路径穿越、文件上传绕过等攻击。本文详解其原理、利用链条和防御方法。</description>
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