Vulnerability · Published Jun 22, 2026 · Assigned by GitHub_M
CVE-2026-54235vLLM: temperature=NaN and temperature=Infinity bypass validation and propagate to GPU kernels
Medium 6.9
In plain English
A medium-severity security flaw in vllm from vllm-project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | vllm | 0.24.0 | GHSA-7h4p-rffg-7823 |
| PyPI | vllm | no fix listed | PYSEC-2026-3405 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| vllm-project | vllm | < 0.23.1rc0 |
Weakness: CWE-1287 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
References
- https://github.com/vllm-project/vllm/security/advisories/GHSA-7h4p-rffg-7823 x_refsource_CONFIRM
- https://github.com/vllm-project/vllm/pull/45116 x_refsource_MISC
- https://github.com/vllm-project/vllm/commit/d598d239737cfa37bcfcb98886ec3f3557fc7198 x_refsource_MISC