CVE-2026-90878: Vllm-Project Vllm

Medium severity, CVSS 4.3. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Vllm-Project Vllm: version 0.27.0 only; version 0.27.1 only

Published 2026-09-15. Last modified 2026-09-15.