CVE-2026-90878

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.

  • Published Sep 15, 2026
  • CVSS 2.1 low
  • 0.5% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-90878 at the National Vulnerability Database