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GBNF Grammar DoS PoC

This repository contains a Proof of Concept (PoC) for a Denial of Service (DoS) vulnerability in llama.cpp's GBNF grammar parser.

Vulnerability

The GBNF parser in llama.cpp (prior to the fix) allows unlimited recursion when parsing nested parentheses. A grammar with deeply nested groups (e.g., ((...))) causes a stack overflow, crashing the application.

Files

dos.gbnf: A malicious grammar file containing 100,000 nested parentheses.

Reproduction

To reproduce the crash (on a vulnerable version):

./llama-cli -m your_model.gguf --grammar-file dos.gbnf -p "test"

Mitigation

This vulnerability is fixed by enforcing a recursion depth limit in llama_grammar_parser.

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