CVE-2026-54235
Medium
Description
vLLM is an inference and serving engine for large language models (LLMs). Prior to 0.23.1rc0, ll temperature validation gates use comparison operators (<, >), which silently evaluate to False for NaN and for positive Infinity in Python's IEEE 754 float semantics. Both values pass every guard and propagate to GPU sampling kernels, where they produce undefined behavior or CUDA errors that can crash the inference worker. This vulnerability is fixed in 0.23.1rc0.
SeverityMedium
CVSS6.5
Exploit probability—
ProductVllm
PublishedJun 22, 2026
First seenJun 22, 2026
Weakness typeCWE-1287CWE-1287
How to fix
Update
- vllm vllm0.23.1 or later
- vllm0.24.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vllm vllm | v < 0.23.1 | 0.23.1 |
| vllmPyPI | 0.8.5 ≤ v < 0.24.0, v ≤ 0.23.0 | 0.24.0 |
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