GHSA-8qvm-5x2c-j2w7 protobuf-python has a potential Denial of Service issue

• PyPI protobuf: < 4.25.8 → fixed in 4.25.8 • PyPI protobuf: >= 5.26.0rc1, < 5.29.5 → fixed in 5.29.5 • PyPI protobuf: >= 6.30.0rc1, < 6.31.1 → fixed in 6.31.1

Summary Any project that uses Protobuf pure-Python backend to parse untrusted Protocol Buffers data containing an arbitrary number of recursive groups, recursive messages or a series of `SGROUP` tags can be corrupted by exceeding the Python recursion limit. Reporter: Alexis Challande, Trail of Bits Ecosystem Security Team [email protected] Affected versions: This issue only affects the pure-Python implementation of protobuf-python backend. This is the implementation when `PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python` environment variable is set or the default when protobuf is used from Bazel or pure-Python PyPi wheels. CPython PyPi wheels do not use pure-Python by default. This is a Python variant of a previous issue affecting protobuf-java. Severity This is a potential Denial of Service. Parsing nested protobuf data creates unbounded recursions that can be abused by an attacker. Proof of Concept For reproduction details, please refer to the unit tests decoder_test.py and message_test Remediation and Mitigation A mitigation is available now. Please update to the latest available versions of the following packages: • protobuf-python(4.25.8, 5.29.5, 6.31.1)