# CVE-2026-90878

## Summary

- **CVE ID:** CVE-2026-90878
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P)
- **CWE:** CWE-400, CWE-404
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## 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.

## Affected Products

- vllm-project — vLLM (0.27.0)
- vllm-project — vLLM (0.27.1)

## References

- [CNA](https://vuldb.com/vuln/403472)
- [CNA](https://vuldb.com/vuln/403472/cti)
- [CNA](https://vuldb.com/cve/CVE-2026-90878)
- [CNA](https://vuldb.com/submit/927901)
- [CNA](https://github.com/vllm-project/vllm/issues/52025)
- [CNA](https://github.com/vllm-project/vllm/pull/52163)
- [CNA](https://github.com/vllm-project/vllm/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 23.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._