{"cve":"CVE-2026-73555","nvd":{"published":"2026-08-13T15:20:17.773","modified":"2026-10-02T19:28:34.510","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3},"cwes":["CWE-209"],"references":["https://github.com/vllm-project/vllm/commit/e87521626febe2763f997691d1599de4175f4324","https://github.com/vllm-project/vllm/pull/46415","https://github.com/vllm-project/vllm/releases/tag/v0.26.0","https://github.com/vllm-project/vllm/security/advisories/GHSA-hwrm-c4cx-rf4j"],"products":["vllm:vllm"],"source":"nvd","synced_at":"2026-10-19T22:48:17.459049833+00:00"},"epss":{"cve":"CVE-2026-73555","score":0.00413,"percentile":0.35224,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-hwrm-c4cx-rf4j","url":"https://osv.dev/vulnerability/GHSA-hwrm-c4cx-rf4j","summary":"vLLM: Unauthenticated Internal Path and Username Disclosure via Validation Error Messages","modified":"2026-09-10T12:25:54.771951503Z","packages":[{"ecosystem":"PyPI","name":"vllm","purl":"pkg:pypi/vllm","ranges":["<0.26.0"],"fixed":["0.26.0"]}]},{"id":"PYSEC-2026-3937","url":"https://osv.dev/vulnerability/PYSEC-2026-3937","summary":"vLLM: Unauthenticated Internal Path and Username Disclosure via Validation Error Messages","modified":"2026-09-10T12:15:14.071548189Z","packages":[{"ecosystem":"PyPI","name":"vllm","purl":"pkg:pypi/vllm","ranges":["<0.26.0"],"fixed":["0.26.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}