llama.cpp Vulnerable to Buffer Overflow via Malicious GGUF Model
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
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| ggml-org | llama.cpp | affected |
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No data available yet.
| Source | ID | Title |
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EUVD |
EUVD-2025-18632 | llama.cpp is an inference of several LLM models in C/C++. Prior to version b5662, an attacker‐supplied GGUF model vocabulary can trigger a buffer overflow in llama.cpp’s vocabulary‐loading code. Specifically, the helper _try_copy in llama.cpp/src/vocab.cpp: llama_vocab::impl::token_to_piece() casts a very large size_t token length into an int32_t, causing the length check (if (length < (int32_t)size)) to be bypassed. As a result, memcpy is still called with that oversized size, letting a malicious model overwrite memory beyond the intended buffer. This can lead to arbitrary memory corruption and potential code execution. This issue has been patched in version b5662. |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.553% probability within 30 days)
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| First Time appeared |
Ggml
Ggml llama.cpp |
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| CPEs | cpe:2.3:a:ggml:llama.cpp:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Ggml
Ggml llama.cpp |
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| Metrics |
ssvc
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| Type | Values Removed | Values Added |
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| Title | llama.cpp Vulnerable to Buffer Overflow via Malicious GGUF Model |
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| Description | llama.cpp is an inference of several LLM models in C/C++. Prior to version b5662, an attacker‐supplied GGUF model vocabulary can trigger a buffer overflow in llama.cpp’s vocabulary‐loading code. Specifically, the helper _try_copy in llama.cpp/src/vocab.cpp: llama_vocab::impl::token_to_piece() casts a very large size_t token length into an int32_t, causing the length check (if (length < (int32_t)size)) to be bypassed. As a result, memcpy is still called with that oversized size, letting a malicious model overwrite memory beyond the intended buffer. This can lead to arbitrary memory corruption and potential code execution. This issue has been patched in version b5662. | |
| Weaknesses | CWE-119 CWE-195 |
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| References |
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| Metrics |
cvssV3_1
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