CVE-2025-48942 – vLLM JSON Schema Deserialization Denial of Service

CVE ID : CVE-2025-48942

Published : May 30, 2025, 7:15 p.m. | 44 minutes ago

Description : vLLM is an inference and serving engine for large language models (LLMs). In versions 0.8.0 up to but excluding 0.9.0, hitting the /v1/completions API with a invalid json_schema as a Guided Param kills the vllm server. This vulnerability is similar GHSA-9hcf-v7m4-6m2j/CVE-2025-48943, but for regex instead of a JSON schema. Version 0.9.0 fixes the issue.

Severity: 6.5 | MEDIUM

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