LLMHigh
CVE-2026-34753: vLLM is an inference and serving engine for large language models (LLMs). From 0.16.0 to before 0.19…
- Occurred
- Apr 6, 2026
- Published
- Apr 6, 2026
- Source
- NVD CVE
Summary
vLLM is an inference and serving engine for large language models (LLMs). From 0.16.0 to before 0.19.0, a server-side request forgery (SSRF) vulnerability in download_bytes_from_url allows any actor who can control batch input JSON to make the vLLM batch runner issue arbitrary HTTP/HTTPS requests from the server, without any URL validation or domain restrictions. This can be used to target internal services (e.g. cloud metadata endpoints or internal HTTP APIs) reachable from the vLLM host. This vulnerability is fixed in 0.19.0.
Tags
- CVE
- CVE-2026-34753
- cvss:MEDIUM
Classification
Category confidence: 95%
Severity confidence: 90%
Rationale: vLLM is an LLM serving engine with a critical SSRF vulnerability allowing unauthorized internal network access.
Classifier: Qwen/Qwen3.5-35B-A3B-FP8