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CVE-2026-78684— vLLM before 0.27.0 Denial of Service via DeepStream Backend

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团队开源的一个适用于 LLM 的高吞吐量和内存高效推理和服务引擎。 vLLM 0.27.0之前版本存在资源管理错误漏洞，该漏洞源于未能正确将DeepStream分类为GPU后端并省略解码路径中的像素限制，可能导致未经身份验证的攻击者在请求时激活DeepStream以初始化进程级GPU解码池并提交绕过资源控制的视频，造成并发请求的部分拒绝服务。

CVSS 5.3 · Medium EPSS 0.61% · P48

Affected Version Matrix 2

VendorProduct Version RangeStatus
vllm-project vllm < 0.27.0 affected
0.27.0 unaffected
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I. Basic Information for CVE-2026-78684

Vulnerability Information
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Vulnerability Title
vLLM before 0.27.0 Denial of Service via DeepStream Backend
Source: CVE Program / CVE List V5
Vulnerability Description
vLLM before 0.27.0 fails to properly classify DeepStream as a GPU backend and omits pixel-limit enforcement in its decode path. Unauthenticated attackers can activate DeepStream at request time to initialize the process-wide GPU decode pool and submit video that bypasses resource controls, causing partial denial of service for concurrent requests.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
vLLM 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
vLLM是vLLM团队开源的一个适用于 LLM 的高吞吐量和内存高效推理和服务引擎。 vLLM 0.27.0之前版本存在资源管理错误漏洞，该漏洞源于未能正确将DeepStream分类为GPU后端并省略解码路径中的像素限制，可能导致未经身份验证的攻击者在请求时激活DeepStream以初始化进程级GPU解码池并提交绕过资源控制的视频，造成并发请求的部分拒绝服务。
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 ~ 0.27.0 -

II. Public POCs for CVE-2026-78684

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III. Intelligence Information for CVE-2026-78684

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Vendor Advisories for CVE-2026-78684 (1)

Exploits & Public PoCs for CVE-2026-78684 (1)

IV. Related Vulnerabilities

Same product: vllm
Same vendor: vllm-project
Same weakness: CWE-400

V. Comments for CVE-2026-78684

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