hacnho/protobuf-descriptor-oneofdecl-dos-poc

Protocol Buffers DescriptorProto oneof_decl materialization DoS PoC

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

Files:

• control_zero_oneofdecl.pb
• malicious_oneofdecl_5000000.pb
• reproduce.py

Observed behavior:

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

Reproduction:

python3 build_poc.py
python3 reproduce.py

Public files:

• https://huggingface.co/hacnho/protobuf-descriptor-oneofdecl-dos-poc/resolve/main/control_zero_oneofdecl.pb
• https://huggingface.co/hacnho/protobuf-descriptor-oneofdecl-dos-poc/resolve/main/malicious_oneofdecl_5000000.pb
• https://huggingface.co/hacnho/protobuf-descriptor-oneofdecl-dos-poc/resolve/main/reproduce.py