{"id":"CVE-2026-73555","title":"vLLM is an inference and serving engine for large language models","summary":"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_m…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-209"],"vendor":"vllm","product":"vllm","affected":["vllm < 0.26.0"],"patched":["vllm 0.26.0"],"published":"2026-08-13","updated":"2026-09-09","sourceUpdated":"2026-09-09T20:58:37.713","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73555","references":[{"url":"https://github.com/vllm-project/vllm/commit/e87521626febe2763f997691d1599de4175f4324","label":"security-advisories@github.com"},{"url":"https://github.com/vllm-project/vllm/pull/46415","label":"security-advisories@github.com"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.26.0","label":"security-advisories@github.com"},{"url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-hwrm-c4cx-rf4j","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73555"},{"url":"https://github.com/advisories/GHSA-hwrm-c4cx-rf4j"},{"url":"https://github.com/vllm-project/vllm"},{"url":"https://pypi.org/project/vllm"}],"tags":["nvd","ghsa","pip","osv"],"epss":0.00255,"epssPercentile":0.17416,"aliases":["GHSA-hwrm-c4cx-rf4j","PYSEC-2026-3937"],"ecosystem":"pip","ingestedAt":"2026-09-04T22:28:54.950Z","slug":"CVE-2026-73555","body":"## Overview\n\nvLLM 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-73555)\n\nAffected packages:\n\n- `vllm < 0.26.0`\n\nPatched in:\n\n- `vllm 0.26.0`\n\nSource: https://github.com/advisories/GHSA-hwrm-c4cx-rf4j","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}