{"id":"CVE-2025-48943","aliases":["GHSA-9hcf-v7m4-6m2j","PYSEC-2025-55"],"title":"vLLM allows clients to crash the openai server with invalid regex","summary":"vLLM allows clients to crash the openai server with invalid regex","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","vendor":"vllm","product":"vllm","ecosystem":"pip","affected":["vllm >= 0.8.0, < 0.9.0"],"patched":["vllm 0.9.0"],"published":"2025-05-28","updated":"2026-08-07","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-9hcf-v7m4-6m2j","references":[{"url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-9hcf-v7m4-6m2j"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-48943"},{"url":"https://github.com/vllm-project/vllm/issues/17313"},{"url":"https://github.com/vllm-project/vllm/pull/17623"},{"url":"https://github.com/vllm-project/vllm/commit/08bf7840780980c7568c573c70a6a8db94fd45ff"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/vllm/PYSEC-2025-55.yaml"},{"url":"https://github.com/vllm-project/vllm"}],"tags":["osv","pip"],"epss":0.00475,"epssPercentile":0.40107,"ingestedAt":"2026-08-07T19:14:14.172Z","slug":"CVE-2025-48943","body":"## Overview\n\n### Impact\n\nA 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.\n\nIssue with more details: https://github.com/vllm-project/vllm/issues/17313\n\n### Patches\n\n* https://github.com/vllm-project/vllm/pull/17623\n\n## Affected packages\n\n- `vllm >= 0.8.0, < 0.9.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `vllm 0.9.0`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}