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tags:
  - security
  - proof-of-concept
  - protobuf
license: mit

Protocol Buffers FieldMask paths materialization DoS PoC

This repository contains a benign security research PoC for a .pb artifact that drives repeated-string materialization during field_mask_pb2.FieldMask.ParseFromString(...).

Files:

control_one_path.pb
malicious_paths_5000000.pb
reproduce.py

Observed behavior:

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

Tested runtime:

python3 -m pip install protobuf==7.35.1