Improper Validation of Specified Type of Input in vLLM - CVE-2026-54235
Published: July 28, 2026
Vulnerability identifier: #VU139877
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-54235
CWE-ID: CWE-1287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper validation of specified type of input in sampling_params.py when processing temperature values. A remote attacker can supply a temperature value of NaN or positive infinity to cause a denial of service.
The issue occurs because Python IEEE 754 float comparison semantics allow these non-finite values to bypass the validation checks and propagate to GPU sampling kernels, which can trigger undefined behavior or CUDA errors.
Affected software
vLLM
How to mitigate CVE-2026-54235
Install security update from vendor's website.
vLLM - update to 0.24.0