CVE-2026-105759 Denial of service in vllm
Unauthenticated attackers can cause memory exhaustion and service disruption in vLLM by sending unique HTTP method tokens to metrics endpoints.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-105759?
CVE-2026-105759 is a medium-severity denial of service vulnerability in Vllm Vllm, published on 5 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
vLLM is an inference and serving engine for large language models. Prior to 0.30.0, the Rust frontend's track_http_metrics middleware records the raw HTTP method token as a Prometheus label for requests reaching registered routes. An unauthenticated attacker can send unique arbitrary method tokens to unguarded routes such as /tokenize, causing Prometheus's Family::get_or_create function to permanently create counter and histogram label sets. Those label sets increase process memory usage and enlarge the /metrics response until the service or monitoring path is exhausted. This issue is fixed in version 0.30.0.
Weakness: CWE-400
Which versions are affected by CVE-2026-105759?
1 open source package ship an affected version, including vllm. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
vllm PyPI | All versions | 0.30.0 |
Products include Vllm Vllm.
How do I fix CVE-2026-105759?
Upgrade vllm to 0.30.0 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-2026-105759 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105759 exists.
Other vulnerabilities in Vllm Vllm
- CVE-2025-32444 vLLM Vulnerable to Remote Code Execution via Mooncake Integration
- CVE-2026-22778 vLLM leaks a heap address when PIL throws an error
- CVE-2025-47277 vLLM Allows Remote Code Execution via PyNcclPipe Communication Service
- CVE-2024-11041 Remote Code Execution in vllm-project/vllm
- CVE-2026-48746 vLLM: OpenAI auth bypass
Sources
Also known as GHSA-5fj9-pfhr-6j48, MINI-4p2r-rvc7-2cx7, MINI-pg7m-x5gf-rwj2, MINI-vvr4-cp7g-ch8v, PYSEC-2026-4325.