QwikSec

Security Database

CVE

CWE

Training

CVE-2025-62426

Published: Nov 21, 2025

Modified: Nov 24, 2025

PUBLISHED

CVSS v3.1

6.5

MEDIUM

Description

vLLM is an inference and serving engine for large language models (LLMs). From version 0.5.5 to before 0.11.1, the /v1/chat/completions and /tokenize endpoints allow a chat_template_kwargs request parameter that is used in the code before it is properly validated against the chat template. With the right chat_template_kwargs parameters, it is possible to block processing of the API server for long periods of time, delaying all other requests. This issue has been patched in version 0.11.1.

Vendor	Product	Versions
vllm-project	vllm	affected `>= 0.5.5, < 0.11.1`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

https://github.com/vllm-project/vllm/security/advisories/GHSA-69j4-grxj-j64p

x_refsource_CONFIRM

https://github.com/vllm-project/vllm/pull/27205

x_refsource_MISC

https://github.com/vllm-project/vllm/commit/3ada34f9cb4d1af763fdfa3b481862a93eb6bd2b

x_refsource_MISC

https://github.com/vllm-project/vllm/blob/2a6dc67eb520ddb9c4138d8b35ed6fe6226997fb/vllm/entrypoints/chat_utils.py#L1602-L1610

x_refsource_MISC

https://github.com/vllm-project/vllm/blob/2a6dc67eb520ddb9c4138d8b35ed6fe6226997fb/vllm/entrypoints/openai/serving_engine.py#L809-L814

x_refsource_MISC

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