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# Systemic OOB memory corruption via hardcoded default special token IDs across multiple tokenizer models in llama.cpp
**Affected software:** ggerganov/llama.cpp
**Bug class:** memory corruption (out-of-bounds read/write via operator[])
**Impact:** Out-of-bounds memory access in the EOG (end-of-generation) token processing loop at llama-vocab.cpp:2646, affecting SPM/llama, T5, and GPT-2 tokenizer models. In release builds without STL assertions, operator[] silently reads/writes adjacent heap memory.
**Format:** gguf
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