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CVE-2026-73559 Details

Description

vLLM is an inference and serving engine for large language models. From 0.19.0 until 0.26.0, the /v1/completions CompletionRequest.prompt field in vllm/entrypoints/openai/completion/protocol.py accepts an unbounded list[str] or list[list[int]], prompt_to_seq() in vllm/renderers/inputs/preprocess.py and OnlineRenderer.preprocess_completion() in vllm/renderers/online_renderer.py expand every element, and vllm/entrypoints/openai/completion/serving.py creates one engine generator and response slot per prompt, allowing an authenticated API client to exhaust CPU, memory, async scheduling capacity, engine request slots, and response buffering with one request. This issue is fixed in version 0.26.0.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/vllm-project/vllm/security/advisories/GHSA-87x5-vmc3-756j	CISA-ADP	ExploitVendor Advisory
https://github.com/vllm-project/vllm/commit/675f4295cdfe0d870471c2b51bfeca3a68a9569e	[email protected]	Patch
https://github.com/vllm-project/vllm/pull/47845	[email protected]	Issue TrackingPatch
https://github.com/vllm-project/vllm/releases/tag/v0.26.0	[email protected]	Release Notes
https://github.com/vllm-project/vllm/security/advisories/GHSA-87x5-vmc3-756j	[email protected]	ExploitVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-400	Uncontrolled Resource Consumption	[email protected]

Affected Products

Product	Versions
vllm vllm	>= 0.19.0, < 0.26.0
CPE cpe:2.3:a:vllm:vllm:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Sep 28, 2026	Initial Analysis	[email protected]
Aug 14, 2026	CVE Modified	CISA-ADP
Aug 13, 2026	New CVE Received	[email protected]