What’s Vulnerable › Vulnerabilities

CVE-2026-54235: vLLM: temperature=NaN and temperature=Infinity bypass validation and propagate to GPU kernels

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-22 · updated 2026-10-25
• Weakness: CWE-1287

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.

Affected products

• vllm-project vllm: before 0.23.1 — fixed in 0.23.1

How to fix

Upgrade to a fixed version: vllm-project vllm 0.23.1. Check the vendor advisory for mitigations.

References

• https://github.com/vllm-project/vllm/commit/d598d239737cfa37bcfcb98886ec3f3557fc7198
• https://github.com/vllm-project/vllm/pull/45116
• https://github.com/vllm-project/vllm/security/advisories/GHSA-7h4p-rffg-7823

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