id: PYSEC-2026-3405
published: "2026-07-13T15:46:18.517395Z"
modified: "2026-07-13T16:07:26.003472Z"
aliases:
- CVE-2026-54235
- GHSA-7h4p-rffg-7823
summary: "vLLM: temperature=NaN and temperature=Infinity bypass validation and propagate to GPU kernels"
details: "## Summary\n\nAll 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. Note: `-Infinity` is correctly caught.\n\n## Root Cause\n\n`sampling_params.py:384`:\n```python\nif 0 < self.temperature < _MAX_TEMP:  # NaN → False; +Inf → False\n```\n\n`sampling_params.py:462`:\n```python\nif self.temperature < 0.0:            # NaN → False; +Inf → False\n    raise VLLMValidationError(...)\n```\n\nNo `math.isnan()` or `math.isinf()` check exists anywhere in `sampling_params.py`.\n\nPython semantics (verified): `float('nan') < 0.0` → `False`, `float('inf') < 0.0` → `False`.\n\n\n## Impact\n\nCrash of inference worker on GPU kernel execution with NaN/Inf softmax input, degrading service for all concurrent users.\n\n## Remediation\n\nAdd `math.isfinite(self.temperature)` check in `_verify_args()`. Reject non-finite float values with a 400 error.\n\n## Fix\n\nA fix for this vulnerability was merged here: https://github.com/vllm-project/vllm/pull/45116"
affected:
- package:
    name: vllm
    ecosystem: PyPI
    purl: pkg:pypi/vllm
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - last_affected: 0.23.0
  versions:
  - 0.0.1
  - 0.1.0
  - 0.1.1
  - 0.1.2
  - 0.1.3
  - 0.1.4
  - 0.1.5
  - 0.1.6
  - 0.1.7
  - 0.10.0
  - 0.10.1
  - 0.10.1.1
  - 0.10.2
  - 0.11.0
  - 0.11.1
  - 0.11.2
  - 0.12.0
  - 0.13.0
  - 0.14.0
  - 0.14.1
  - 0.15.0
  - 0.15.1
  - 0.16.0
  - 0.17.0
  - 0.17.1
  - 0.18.0
  - 0.18.1
  - 0.19.0
  - 0.19.1
  - 0.2.0
  - 0.2.1
  - 0.2.1.post1
  - 0.2.2
  - 0.2.3
  - 0.2.4
  - 0.2.5
  - 0.2.6
  - 0.2.7
  - 0.20.0
  - 0.20.1
  - 0.20.2
  - 0.21.0
  - 0.22.0
  - 0.22.1
  - 0.23.0
  - 0.3.0
  - 0.3.1
  - 0.3.2
  - 0.3.3
  - 0.4.0
  - 0.4.0.post1
  - 0.4.1
  - 0.4.2
  - 0.4.3
  - 0.5.0
  - 0.5.0.post1
  - 0.5.1
  - 0.5.2
  - 0.5.3
  - 0.5.3.post1
  - 0.5.4
  - 0.5.5
  - 0.6.0
  - 0.6.1
  - 0.6.1.post1
  - 0.6.1.post2
  - 0.6.2
  - 0.6.3
  - 0.6.3.post1
  - 0.6.4
  - 0.6.4.post1
  - 0.6.5
  - 0.6.6
  - 0.6.6.post1
  - 0.7.0
  - 0.7.1
  - 0.7.2
  - 0.7.3
  - 0.8.0
  - 0.8.1
  - 0.8.2
  - 0.8.3
  - 0.8.4
  - 0.8.5
  - 0.8.5.post1
  - 0.9.0
  - 0.9.0.1
  - 0.9.1
  - 0.9.2
references:
- type: WEB
  url: https://github.com/vllm-project/vllm/security/advisories/GHSA-7h4p-rffg-7823
- type: WEB
  url: https://github.com/vllm-project/vllm/pull/45116
- type: WEB
  url: https://github.com/vllm-project/vllm/commit/d598d239737cfa37bcfcb98886ec3f3557fc7198
- type: PACKAGE
  url: https://github.com/vllm-project/vllm
- type: PACKAGE
  url: https://pypi.org/project/vllm
- type: ADVISORY
  url: https://github.com/advisories/GHSA-7h4p-rffg-7823
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2026-54235
severity:
- type: CVSS_V4
  score: 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