{"id":"CVE-2026-73555","aliases":["GHSA-hwrm-c4cx-rf4j"],"url":"https://o3.security/vulnerability/CVE-2026-73555","summary":"vLLM: Unauthenticated Internal Path and Username Disclosure via Validation Error Messages","details":"vLLM is an inference and serving engine for large language models. Prior to 0.26.0, the validation_exception_handler in vllm/entrypoints/openai/server_utils.py converts FastAPI RequestValidationError objects with str(exc), and sanitize_message in vllm/entrypoints/utils.py does not remove traceback-style file paths, allowing unauthenticated malformed JSON requests to /v1/chat/completions, /v1/completions, /tokenize, and /detokenize to disclose the OS username, home and virtual-environment paths, Python version, internal package structure, line numbers, and endpoint handler names. This issue is fixed in version 0.26.0.","published":"2026-08-13T14:50:03.539Z","modified":"2026-08-16T03:31:11.018914931Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"vllm","fixedVersion":"0.26.0"}],"fix":{"url":"https://github.com/vllm-project/vllm/commit/e87521626febe2763f997691d1599de4175f4324","label":"vllm-project/vllm@e875216"},"references":[{"type":"WEB","url":"https://github.com/vllm-project/vllm/releases/tag/v0.26.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73555.json"},{"type":"ADVISORY","url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-hwrm-c4cx-rf4j"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73555"},{"type":"FIX","url":"https://github.com/vllm-project/vllm/commit/e87521626febe2763f997691d1599de4175f4324"},{"type":"FIX","url":"https://github.com/vllm-project/vllm/pull/46415"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-16T03:31:11.018914931Z"}}