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Protocol Buffers MFV PoC: C Stack Overflow via Deeply Nested Message

Vulnerability

When protobuf Python C extension has allow_oversize_protos=True (via _message.SetAllowOversizeProtos(True)), the C++ recursion limit is set to INT_MAX. A deeply nested .pb message (~44,000 levels) causes C stack overflow → SIGSEGV (SEGFAULT).

Reproduction

from google.protobuf.pyext import _message
_message.SetAllowOversizeProtos(True)
# Load malicious.pb → SIGSEGV

Files

malicious.pb — 170KB .pb file with 44,000 layers of nested messages
gen_poc.py — generator script

Downloads last month: 42

Total file size:

175 kB