vLLM is an inference and serving engine for large language models. Prior to 0.32.0, vllm/tokenizers/hf.py computes max_token_id with an off-by-one upper bound, allowing a pre-tokenized prompt ID equal to the vocabulary size to pass validation. For a tensor-parallel size of one and an exact multiple-of-64 vocabulary, VocabParallelEmbedding.forward does not mask that value before F.embedding uses it, causing a CUDA device-side assertion and terminating the engine. This issue is fixed in version 0.32.0.
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History
Mon, 02 Nov 2026 18:30:00 +0000
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ssvc
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Wed, 28 Oct 2026 15:45:00 +0000
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| CPEs | cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:* |
Tue, 27 Oct 2026 12:30:00 +0000
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threat_severity
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threat_severity
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Mon, 26 Oct 2026 18:45:00 +0000
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Vllm
Vllm vllm Vllm-project Vllm-project vllm |
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Vllm
Vllm vllm Vllm-project Vllm-project vllm |
Mon, 26 Oct 2026 17:30:00 +0000
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| Description | vLLM is an inference and serving engine for large language models. Prior to 0.32.0, vllm/tokenizers/hf.py computes max_token_id with an off-by-one upper bound, allowing a pre-tokenized prompt ID equal to the vocabulary size to pass validation. For a tensor-parallel size of one and an exact multiple-of-64 vocabulary, VocabParallelEmbedding.forward does not mask that value before F.embedding uses it, causing a CUDA device-side assertion and terminating the engine. This issue is fixed in version 0.32.0. | |
| Title | vLLM: Out-of-vocabulary prompt token id passes input validation and triggers a CUDA device-side assert (engine crash / DoS) | |
| Weaknesses | CWE-129 CWE-193 |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-10-26T17:18:17.582Z
Updated: 2026-11-02T17:50:28.478Z
Reserved: 2026-10-23T20:21:45.107Z
Link: CVE-2026-115916
Updated: 2026-11-02T17:49:57.747Z
Status : Analyzed
Published: 2026-10-26T18:17:39.080
Modified: 2026-11-02T18:18:39.033
Link: CVE-2026-115916