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fastjson2

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Docker labs + defensive scanner for fastjson remote-class-load RCE. fastjson 1.2.66-1.2.83: @jsontype resource probe (CVE-2026-16723). fastjson2 2.0.57: attacker @type reaches loadClass with autoType DISABLED via polymorphic types (@jsontype(seeAlso) / Jackson @JsonSubTypes). Marker-only payloads; safeMode + JDK17 controls.

  • Updated Jul 27, 2026
  • Python

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