CVE-2026-90878

Medium

Description

A vulnerability was determined in vllm-project vLLM up to 0.27.1. This affects an unknown part of the file /v1/chat/completions of the component Jinja Template Rendering. This manipulation of the argument chat_template causes resource consumption. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. The pull request to fix this issue awaits acceptance.

SeverityMedium

CVSS4.3

Exploit probability—

ProductVllm

PublishedSep 15, 2026

First seenSep 15, 2026

Weakness typeCWE-400Uncontrolled resource consumption CWE-404CWE-404

How to fix

Patches

github.com/vllm-project/vllm/pull/52163

Affected products

Product	Affected versions	Fixed in
vllm-project vllm	0.27.0, 0.27.1	—

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