Vulnerability in Vllm-Project Vllm
CVE-2026-115916
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Vllm-Project Vllm — versions < 0.32.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-115916?
- CVE-2026-115916 is a medium-severity vulnerability in Vllm-Project Vllm, classified under Improper Validation of Array Index. CVSS score: 6.5/10. Published 2026-10-26.
- How severe is CVE-2026-115916?
- Medium severity. CVSS v3 base score is 6.5 out of 10.