GHSA-9hcf-v7m4-6m2j: vLLM allows clients to crash the openai server with invalid regex

May 28, 2025

A denial of service bug caused the vLLM server to crash if an invalid regex was provided while using structured output. This vulnerability is similar to GHSA-6qc9-v4r8-22xg, but for regex instead of a JSON schema.

Issue with more details: https://github.com/vllm-project/vllm/issues/17313

References

github.com/advisories/GHSA-9hcf-v7m4-6m2j
github.com/vllm-project/vllm
github.com/vllm-project/vllm/commit/08bf7840780980c7568c573c70a6a8db94fd45ff
github.com/vllm-project/vllm/issues/17313
github.com/vllm-project/vllm/pull/17623
github.com/vllm-project/vllm/security/advisories/GHSA-9hcf-v7m4-6m2j

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