CVE-2025-52566 — llama.cpp tokenizer signed vs. unsigned heap overflow

Affected: ggml-org llama.cpp

llama.cpp is an inference of several LLM models in C/C++. Prior to version b5721, there is a signed vs. unsigned integer overflow in llama.cpp's tokenizer implementation (llama_vocab::tokenize) (src/llama-vocab.cpp:3036) resulting in unintended behavior in tokens copying size comparison. Allowing heap-overflowing llama.cpp inferencing engine with carefully manipulated text input during tokenization process. This issue has been patched in version b5721.

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CVE-2025-52566 — llama.cpp tokenizer signed vs. unsigned heap overflow