Input validation error in vLLM - CVE-2025-48944
Published: January 7, 2026
Vulnerability identifier: #VU121081
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-48944
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: vLLM
Affected software:
vLLM
vLLM
Detailed vulnerability description
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input passed via the in the "pattern" and "type" fields to the /v1/chat/completions OpenAPI endpoint A remote user can pass specially crafted input to the application and perform a denial of service (DoS) attack.
How to mitigate CVE-2025-48944
Install updates from vendor's website.