CVE-2026-115916

vLLM: Out-of-vocabulary prompt token id passes input validation and triggers a CUDA device-side assert (engine crash / DoS)

publishedCWE-129CWE-193

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.

Technical severity6.5 mediumCVSS 3.1 · CNA: GitHub_M

Published2026-10-26Source updated 2026-11-02

Collected2026-11-023 attributed sources

Fixes and workarounds

Fix

vllm (PyPI): OSV reports a fixed version 0.32.0. Check the advisory for supported release branches.

Source: OSV GHSA-q97c-p368-75c4

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
vllm vllm-project	< 0.32.0 (affected)	CNA: GitHub_M
vllm `vllm` PyPI	0.0.1 (affected, PyPI) 0.1.0 (affected, PyPI) 0.1.1 (affected, PyPI) 0.1.2 (affected, PyPI) 0.1.3 (affected, PyPI) 0.1.4 (affected, PyPI) 0.1.5 (affected, PyPI) 0.1.6 (affected, PyPI) 0.1.7 (affected, PyPI) 0.10.0 (affected, PyPI) 0.10.1 (affected, PyPI) 0.10.1.1 (affected, PyPI) 0.10.2 (affected, PyPI) 0.11.0 (affected, PyPI) 0.11.1 (affected, PyPI) 0.11.2 (affected, PyPI) 0.12.0 (affected, PyPI) 0.13.0 (affected, PyPI) 0.14.0 (affected, PyPI) 0.14.1 (affected, PyPI) 0.15.0 (affected, PyPI) 0.15.1 (affected, PyPI) 0.16.0 (affected, PyPI) 0.17.0 (affected, PyPI) 0.17.1 (affected, PyPI) 0.18.0 (affected, PyPI) 0.18.1 (affected, PyPI) 0.19.0 (affected, PyPI) 0.19.1 (affected, PyPI) 0.2.0 (affected, PyPI) 0.2.1 (affected, PyPI) 0.2.1.post1 (affected, PyPI) 0.2.2 (affected, PyPI) 0.2.3 (affected, PyPI) 0.2.4 (affected, PyPI) 0.2.5 (affected, PyPI) 0.2.6 (affected, PyPI) 0.2.7 (affected, PyPI) 0.20.0 (affected, PyPI) 0.20.1 (affected, PyPI) 0.20.2 (affected, PyPI) 0.21.0 (affected, PyPI) 0.22.0 (affected, PyPI) 0.22.1 (affected, PyPI) 0.23.0 (affected, PyPI) 0.24.0 (affected, PyPI) 0.25.0 (affected, PyPI) 0.25.1 (affected, PyPI) 0.26.0 (affected, PyPI) 0.27.0 (affected, PyPI) 0.27.1 (affected, PyPI) 0.28.0 (affected, PyPI) 0.29.0 (affected, PyPI) 0.3.0 (affected, PyPI) 0.3.1 (affected, PyPI) 0.3.2 (affected, PyPI) 0.3.3 (affected, PyPI) 0.30.0 (affected, PyPI) 0.31.0 (affected, PyPI) 0.4.0 (affected, PyPI) 0.4.0.post1 (affected, PyPI) 0.4.1 (affected, PyPI) 0.4.2 (affected, PyPI) 0.4.3 (affected, PyPI) 0.5.0 (affected, PyPI) 0.5.0.post1 (affected, PyPI) 0.5.1 (affected, PyPI) 0.5.2 (affected, PyPI) 0.5.3 (affected, PyPI) 0.5.3.post1 (affected, PyPI) 0.5.4 (affected, PyPI) 0.5.5 (affected, PyPI) 0.6.0 (affected, PyPI) 0.6.1 (affected, PyPI) 0.6.1.post1 (affected, PyPI) 0.6.1.post2 (affected, PyPI) 0.6.2 (affected, PyPI) 0.6.3 (affected, PyPI) 0.6.3.post1 (affected, PyPI) 0.6.4 (affected, PyPI) 0.6.4.post1 (affected, PyPI) 0.6.5 (affected, PyPI) 0.6.6 (affected, PyPI) 0.6.6.post1 (affected, PyPI) 0.7.0 (affected, PyPI) 0.7.1 (affected, PyPI) 0.7.2 (affected, PyPI) 0.7.3 (affected, PyPI) 0.8.0 (affected, PyPI) 0.8.1 (affected, PyPI) 0.8.2 (affected, PyPI) 0.8.3 (affected, PyPI) 0.8.4 (affected, PyPI) 0.8.5 (affected, PyPI) 0.8.5.post1 (affected, PyPI) 0.9.0 (affected, PyPI) 0.9.0.1 (affected, PyPI) 0.9.1 (affected, PyPI) 0.9.2 (affected, PyPI) Ecosystem version events: introduced 0; fixed 0.32.0 Source events (ECOSYSTEM) `[ { "introduced": "0" }, { "fixed": "0.32.0" } ]` Other versions: unaffected	OSV GHSA-q97c-p368-75c4

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 6.5 medium	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`	CNA: GitHub_M

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://github.com/vllm-project/vllm/security/advisories/GHSA-q97c-p368-75c4CNA: GitHub_M · x_refsource_CONFIRM
https://github.com/vllm-project/vllm/pull/59491CNA: GitHub_M · x_refsource_MISC
https://github.com/vllm-project/vllm/commit/37cecc8141e2dcba9dd534897a164d4baaf27229CNA: GitHub_M · x_refsource_MISC
https://github.com/vllm-project/vllm/releases/tag/v0.32.0CNA: GitHub_M · x_refsource_MISC
https://github.com/advisories/GHSA-q97c-p368-75c4OSV / GitHub Security Advisories · advisory
https://osv.dev/vulnerability/GHSA-q97c-p368-75c4OSV / GitHub Security Advisories · osv

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