CVE-2025-48943

vLLM is an inference and serving engine for large language models (LLMs). Version 0.8.0 up to but excluding 0.9.0 have a Denial of Service (ReDoS) that causes the vLLM server to crash if an invalid regex was provided while using structured output. This vulnerability is similar to GHSA-6qc9-v4r8-22xg/CVE-2025-48942, 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/17313
• https://github.com/vllm-project/vllm/pull/17623
• https://github.com/vllm-project/vllm/security/advisories/GHSA-9hcf-v7m4-6m2j