CVE-2026-78684 vLLM before 0.27.0 Denial of Service via DeepStream Backend

What is CVE-2026-78684?

CVE-2026-78684 is a medium-severity denial of service vulnerability in Vllm Vllm, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

vLLM before 0.27.0 fails to properly classify DeepStream as a GPU backend and omits pixel-limit enforcement in its decode path. Unauthenticated attackers can activate DeepStream at request time to initialize the process-wide GPU decode pool and submit video that bypasses resource controls, causing partial denial of service for concurrent requests.

Weakness: CWE-400

Which versions are affected by CVE-2026-78684?

1 open source package ship an affected version, including vllm. It affects 1 product.

Products include Vllm Vllm.

How do I fix CVE-2026-78684?

Upgrade vllm to 0.27.0 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-78684 being exploited?

There is no known exploitation of CVE-2026-78684 in the wild and no public exploit code.

Other vulnerabilities in Vllm Vllm

• CVE-2025-32444 vLLM Vulnerable to Remote Code Execution via Mooncake Integration Critical 10.0
• CVE-2026-22778 vLLM leaks a heap address when PIL throws an error Critical 9.8
• CVE-2025-47277 vLLM Allows Remote Code Execution via PyNcclPipe Communication Service Critical 9.8
• CVE-2024-11041 Remote Code Execution in vllm-project/vllm Critical 9.8
• CVE-2026-48746 vLLM: OpenAI auth bypass Critical 9.1

All Vllm Vllm vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as GHSA-cqm8-jxg6-fqfq, GHSA-hw36-j4q7-vjxx, MINI-cfvq-84x6-mx88, MINI-gj6c-q4cr-94mh, MINI-vhmh-58gf-hxmr, PYSEC-2026-4003.