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.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://github.com/vllm-project/vllm/commit/3735c2d5f5248259482b9045c34fb7a8a3892352 Patch
- https://github.com/vllm-project/vllm/pull/56058 Issue Tracking, Patch
- https://github.com/vllm-project/vllm/security/advisories/GHSA-5fj9-pfhr-6j48 Exploit, Vendor Advisory
- https://github.com/vllm-project/vllm/security/advisories/GHSA-5fj9-pfhr-6j48 Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · vllmNVD modified 2026-10-16 20:41
Affected (CPE criteria) 1
cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*
References 5
- https://github.com/vllm-project/vllm/commit/3735c2d5f5248259482b9045c34fb7a8a3892352 Patch
- https://github.com/vllm-project/vllm/pull/56058 Issue Tracking, Patch
- https://github.com/vllm-project/vllm/releases/tag/v0.30.0 Release Notes
- https://github.com/vllm-project/vllm/security/advisories/GHSA-5fj9-pfhr-6j48 Exploit, Vendor Advisory
- https://github.com/vllm-project/vllm/security/advisories/GHSA-5fj9-pfhr-6j48 Exploit, Vendor Advisory