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CVE-2026-44222— vLLM: Remote DoS via Special-Token Placeholders

Quick assessment

Affected
vllm-project vllm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

vLLM是vLLM开源的一个适用于 LLM 的高吞吐量和内存高效推理和服务引擎。 vLLM 0.6.1至0.20.0之前版本存在输入验证错误漏洞，该漏洞源于多模态处理中的令牌注入漏洞，可能导致未经身份验证的纯文本提示被解释为控制令牌，以及缺少匹配数据的图像和视频占位符序列导致未处理的IndexError，终止工作进程或降低可用性。

CVSS 6.5 · Medium EPSS 0.46% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
vllm-project vllm >= 0.6.1, < 0.20.0 affected
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I. Basic Information for CVE-2026-44222

Vulnerability Information
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Vulnerability Title
vLLM: Remote DoS via Special-Token Placeholders
Source: CVE Program / CVE List V5
Vulnerability Description
vLLM is an inference and serving engine for large language models (LLMs). From 0.6.1 to before 0.20.0, there is a a Token Injection vulnerability in vLLM’s multimodal processing. Unauthenticated, text-only prompts that spell special tokens are interpreted as control. Image and video placeholder sequences supplied without matching data cause vLLM to index into empty grids during input-position computation, raising an unhandled IndexError and terminating the worker or degrading availability. Multimodal paths that rely on image_grid_thw/video_grid_thw are affected. This vulnerability is fixed in 0.20.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
vLLM 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
vLLM是vLLM开源的一个适用于 LLM 的高吞吐量和内存高效推理和服务引擎。 vLLM 0.6.1至0.20.0之前版本存在输入验证错误漏洞，该漏洞源于多模态处理中的令牌注入漏洞，可能导致未经身份验证的纯文本提示被解释为控制令牌，以及缺少匹配数据的图像和视频占位符序列导致未处理的IndexError，终止工作进程或降低可用性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vllm-project vllm >= 0.6.1, < 0.20.0 -

II. Public POCs for CVE-2026-44222

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III. Intelligence Information for CVE-2026-44222

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Vendor Advisories for CVE-2026-44222 (1)

IV. Related Vulnerabilities

Same product: vllm
Same vendor: vllm-project
Same weakness: CWE-129

V. Comments for CVE-2026-44222

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