hacnho/protobuf-descriptor-reserved-name-dos-poc

Protocol Buffers DescriptorProto reserved_name materialization DoS PoC

This repository contains a benign security research PoC for a .pb artifact that drives large memory materialization during descriptor_pb2.DescriptorProto.ParseFromString(...).

Files:

• control_one_reserved_name.pb
• malicious_reserved_name_5000000.pb
• reproduce.py

Observed behavior:

• control artifact:
  • parses successfully with one reserved_name
• malicious artifact:
  • parses successfully with 5,000,000 reserved_name entries
  • materially increases peak RSS during normal parse

Reproduction:

python3 build_poc.py
python3 reproduce.py