[GHSA-crf3-v9rr-v7hj] fastjson has a remote code execution (RCE) vulnerability - #9326
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[GHSA-crf3-v9rr-v7hj] fastjson has a remote code execution (RCE) vulnerability#9326zc-18 wants to merge 1 commit into
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September 3, 2026 11:19
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The current affected range starts at fastjson 1.2.68. Testing of the same vulnerability mechanism confirms that fastjson 1.2.37 is also affected.
Under identical test conditions (Spring Boot 2.1.9.RELEASE, OpenJDK 1.8.0_291 (JDK 8), Fastjson parsing API JSON.parseObject(json)), a benign reproduction successfully reaches the vulnerable code path on fastjson 1.2.37. AutoType remains disabled and no third-party classpath gadget is required.
Boundary testing produced the following results:
1.2.36: not affected
1.2.37: affected
The relevant vulnerable code path was introduced in alibaba/fastjson@1.2.36...1.2.37 and remains present through version 1.2.83.
Reproduction steps, environment details, artifact hashes, logs, and the complete version matrix are available at:
Write-up: https://zc-18.github.io/2026/08/20/fastjson04/
Artifacts: https://cdn.jsdelivr.net/gh/zc-18/chuanimages@main/img/202608192021102.7z
Please change the affected version range from >= 1.2.68, <= 1.2.83 to >= 1.2.37, <= 1.2.83.