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PoC: XGBoost OOB Memory Access via JSON Model

SECURITY RESEARCH ONLY - Do not load this model in production.

This JSON model file contains out-of-bounds node indices (left_children[0] = 99999 when only 3 nodes exist). When loaded by XGBoost, this causes heap OOB read/write in RegTree::LoadModel and during prediction traversal.

Affected code: src/tree/tree_model.cc lines 1084-1090 Trigger: xgb.Booster().load_model("malicious_model.json")

Submitted to huntr.com by Ryan @ Fan Pier Labs (ryan@fanpierlabs.com)

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