CVE-2026-55514 vLLM denial of service via prompt embeds on M-RoPE models

What is CVE-2026-55514?

CVE-2026-55514 is a high-severity denial of service vulnerability in Vllm Vllm, published on 6 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

vLLM is a library for LLM inference and serving. From 0.12.0 to before 0.24.0, sending a pure prompt embeds payload in a /v1/completions request with a model using M-RoPE causes EngineCore to fail an assertion and fatally crash, shutting down the entire server application. Any remote user who is authorized to make a /v1/completions request can make such a request and induce a crash. This issue is fixed in version 0.24.0.

Weakness: CWE-617

Which versions are affected by CVE-2026-55514?

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

Products include Vllm Vllm.

How do I fix CVE-2026-55514?

Upgrade vllm to 0.24.0 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-2026-55514 being exploited?

There is no known exploitation of CVE-2026-55514 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
• How this page is made

Also known as GHSA-33cg-gxv8-3p8g, MINI-65j4-pmrh-92r8, MINI-67q5-c6xv-mxf4, MINI-j43w-23g3-3cqr, PYSEC-2026-2303.