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README.md

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+---
+tags:
+  - security
+  - proof-of-concept
+  - protobuf
+license: mit
+---
+
+# Protocol Buffers Field options materialization DoS PoC
+
+This repository contains a benign security research PoC for a `.pb` artifact
+that drives repeated-message materialization during
+`type_pb2.Field.ParseFromString(...)`.
+
+Files:
+
+- `control_one_name.pb`
+- `malicious_options_5000000.pb`
+- `reproduce.py`
+
+Observed behavior:
+
+- control artifact:
+  - parses successfully with no `options` entries
+- malicious artifact:
+  - parses successfully with `5,000,000` `options` entries
+  - materially increases peak RSS during normal parse
+
+Tested runtime:
+
+```bash
+python3 -m pip install protobuf==7.35.1
+```
+
+Public reproduction:
+
+```bash
+curl -L -O https://huggingface.co/hacnho/protobuf-type-field-options-dos-poc/resolve/main/control_one_name.pb
+curl -L -O https://huggingface.co/hacnho/protobuf-type-field-options-dos-poc/resolve/main/malicious_field_options_5000000.pb
+curl -L -O https://huggingface.co/hacnho/protobuf-type-field-options-dos-poc/resolve/main/reproduce.py
+python3 reproduce.py --control control_one_name.pb --malicious malicious_field_options_5000000.pb
+```