Resource exhaustion in vLLM - #VU139883
Published: July 28, 2026
Vulnerability identifier: #VU139883
CSH Severity: Low
CVSS v4: 7.1 [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]
CVE-ID: N/A
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the /v1/completions serving path when processing list-shaped prompt inputs. A remote user can send a specially crafted completion request with an oversized prompt list to cause a denial of service.
The issue affects requests where the prompt parameter is supplied as a list of text prompts or a list of token-id prompts, causing one backend subrequest and one response slot to be created for each list element.
Affected software
vLLM
Remediation
Install security update from vendor's website.
vLLM - update to 0.26.0