Protocol Buffers Value struct_value.fields materialization DoS PoC

This repository contains a benign security research PoC for a .pb artifact that drives repeated map-entry materialization during struct_pb2.Value.ParseFromString(...).

Files:

control_one_struct_value.pb
malicious_struct_value_fields_1400000.pb
reproduce.py

Observed behavior:

control artifact:
- parses successfully with one struct_value field
malicious artifact:
- parses successfully with 1,400,000 nested struct fields
- materially increases peak RSS during normal parse

Tested runtime:

python3 -m pip install protobuf==7.35.1

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