CVE-2025-48942

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.

Weakness

An exception is thrown from a function, but it is not caught.

References

• https://github.com/vllm-project/vllm/commit/08bf7840780980c7568c573c70a6a8db94fd45ff
• https://github.com/vllm-project/vllm/issues/17248
• https://github.com/vllm-project/vllm/pull/17623
• https://github.com/vllm-project/vllm/security/advisories/GHSA-6qc9-v4r8-22xg