Protocol Buffers FeatureSetDefaults defaults materialization DoS PoC

This repository contains a benign security research PoC for a .pb artifact that drives repeated-message materialization during descriptor_pb2.FeatureSetDefaults.ParseFromString(...).

Files:

control_one_default.pb
malicious_defaults_5000000.pb
reproduce.py

Observed behavior:

control artifact:
- parses successfully with one defaults entry
malicious artifact:
- parses successfully with 5,000,000 defaults entries
- materially increases peak RSS during normal parse

Tested runtime:

python3 -m pip install protobuf==7.35.1

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