vLLM allows clients to crash the openai server with invalid regex
### Impact 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](https://github.com/vllm-project/vllm/security/advisories/GHSA-6qc9-v4r8-22xg), but for regex instead of a JSON schema. Issue with more details: https://github.com/vllm-project/vllm/issues/17313 ### Patches * https://github.com/vllm-project/vllm/pull/17623
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-48943US | — | — | ||
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 cr… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/pypa/advisory-database/tree/main/vulns/vllm/PYSEC-2025-55.yamlWEB
- https://github.com/vllm-project/vllmPACKAGE
- https://github.com/vllm-project/vllm/commit/08bf7840780980c7568c573c70a6a8db94fd45ffWEB
- https://github.com/vllm-project/vllm/issues/17313WEB
- https://github.com/vllm-project/vllm/pull/17623WEB
- https://github.com/vllm-project/vllm/security/advisories/GHSA-9hcf-v7m4-6m2jWEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-48943ADVISORY
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