{"id":"CVE-2025-48943","aliases":["GHSA-9hcf-v7m4-6m2j","PYSEC-2025-55"],"url":"https://o3.security/vulnerability/CVE-2025-48943","summary":"vLLM allows clients to crash the openai server with invalid regex","details":"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.","published":"2025-05-30T18:36:01.519Z","modified":"2026-08-12T03:51:34.892281451Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"vllm","fixedVersion":"0.9.0"}],"fix":{"url":"https://github.com/vllm-project/vllm/commit/08bf7840780980c7568c573c70a6a8db94fd45ff","label":"vllm-project/vllm@08bf784"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/48xxx/CVE-2025-48943.json"},{"type":"ADVISORY","url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-9hcf-v7m4-6m2j"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-48943"},{"type":"REPORT","url":"https://github.com/vllm-project/vllm/issues/17313"},{"type":"FIX","url":"https://github.com/vllm-project/vllm/commit/08bf7840780980c7568c573c70a6a8db94fd45ff"},{"type":"FIX","url":"https://github.com/vllm-project/vllm/pull/17623"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/vllm/PYSEC-2025-55.yaml"},{"type":"PACKAGE","url":"https://github.com/vllm-project/vllm"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:34.892281451Z"}}