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Vulnerability Intelligence
Miggo AI
Miggo AIMiggo AI
JavaJavaMiggo AIRoot Cause AnalysisThe vulnerability stems from the checkAutoType() function's handling of autoType validation. Key indicators from the commit diff show: 1) Expansion of denyHashCodes to block more dangerous classes 2) Added null return for Exception-derived classes when autoTypeSupport=false 3) Modified test case showing Exception deserialization behavior changed. The function's previous failure to properly validate() these edge cases allowed bypassing autoType restrictions through crafted payloads, particularly leveraging Exception inheritance chains which were not adequately restricted prior to 1.2.83.
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| com.alibaba:fastjson | maven | >= 1.2.25, < 1.2.83 | 1.2.83 |
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