CVE-2026-90878: Resource Consumption in vllm-project vLLM
CVE-2026-90878 is a medium severity vulnerability in vllm-project vLLM versions 0.27.0 and 0.27.1. It involves resource consumption caused by manipulation of the chat_template argument in the Jinja Template Rendering component at the /v1/chat/completions endpoint. The vulnerability can be exploited remotely without user interaction and requires low privileges. A fix has been proposed but is not yet accepted.
AI Analysis
Technical Summary
This vulnerability affects vllm-project vLLM up to version 0.27.1 in the Jinja Template Rendering component of the /v1/chat/completions endpoint. An attacker can remotely manipulate the chat_template argument to cause resource consumption, potentially leading to denial of service or degraded performance. The vulnerability has been publicly disclosed, and a pull request to fix it is pending acceptance, indicating no official patch is available yet.
Potential Impact
Exploitation of this vulnerability can lead to resource exhaustion on the affected system, potentially causing denial of service or degraded service availability. The attack requires low privileges and no user interaction, increasing the risk of remote exploitation. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is not yet officially available as the pull request to address the issue awaits acceptance. Users should monitor the vendor's repository or advisory channels for the official patch and apply it promptly once released. Until then, consider implementing resource usage limits or other protective controls at the application or infrastructure level to mitigate potential impact.
CVE-2026-90878: Resource Consumption in vllm-project vLLM
Description
CVE-2026-90878 is a medium severity vulnerability in vllm-project vLLM versions 0.27.0 and 0.27.1. It involves resource consumption caused by manipulation of the chat_template argument in the Jinja Template Rendering component at the /v1/chat/completions endpoint. The vulnerability can be exploited remotely without user interaction and requires low privileges. A fix has been proposed but is not yet accepted.
CVSS v4.0
Score 5.3medium
Affected software
vllm-project
vLLM
cpe:2.3:a:vllm-project:vllm:*:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability affects vllm-project vLLM up to version 0.27.1 in the Jinja Template Rendering component of the /v1/chat/completions endpoint. An attacker can remotely manipulate the chat_template argument to cause resource consumption, potentially leading to denial of service or degraded performance. The vulnerability has been publicly disclosed, and a pull request to fix it is pending acceptance, indicating no official patch is available yet.
Potential Impact
Exploitation of this vulnerability can lead to resource exhaustion on the affected system, potentially causing denial of service or degraded service availability. The attack requires low privileges and no user interaction, increasing the risk of remote exploitation. However, there are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is not yet officially available as the pull request to address the issue awaits acceptance. Users should monitor the vendor's repository or advisory channels for the official patch and apply it promptly once released. Until then, consider implementing resource usage limits or other protective controls at the application or infrastructure level to mitigate potential impact.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-09-14T07:16:13.062Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa8ca4255bf5e2cf521ce78
Added to database: 09/15/2026, 04:32:02 UTC
Last enriched: 09/15/2026, 04:46:27 UTC
Last updated: 09/15/2026, 05:16:57 UTC
Views: 6
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