{"id":"CVE-2026-73555","state":"PUBLISHED","title":"vLLM: Unauthenticated Internal Path and Username Disclosure via Validation Error Messages","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.","publishedAt":"2026-08-13T14:50:03.539Z","updatedAt":"2026-08-14T15:57:23.396Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["vllm-project vllm"],"affected":[{"vendor":"vllm-project","product":"vllm","versions":[{"version":"< 0.26.0","status":"affected"}]}],"references":["https://github.com/vllm-project/vllm/security/advisories/GHSA-hwrm-c4cx-rf4j","https://github.com/vllm-project/vllm/pull/46415","https://github.com/vllm-project/vllm/commit/e87521626febe2763f997691d1599de4175f4324","https://github.com/vllm-project/vllm/releases/tag/v0.26.0"],"weaknesses":["CWE-209"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/73xxx/CVE-2026-73555.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73555","state":"PUBLISHED","datePublished":"2026-08-13T14:50:03.539Z","dateUpdated":"2026-08-14T15:57:23.396Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-12T20:53:46.380Z"},"containers":{"cna":{"title":"vLLM: Unauthenticated Internal Path and Username Disclosure via Validation Error Messages","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"vllm-project","product":"vllm","versions":[{"version":"< 0.26.0","status":"affected"}]}],"references":[{"url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-hwrm-c4cx-rf4j","name":"https://github.com/vllm-project/vllm/security/advisories/GHSA-hwrm-c4cx-rf4j","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/vllm-project/vllm/pull/46415","name":"https://github.com/vllm-project/vllm/pull/46415","tags":["x_refsource_MISC"]},{"url":"https://github.com/vllm-project/vllm/commit/e87521626febe2763f997691d1599de4175f4324","name":"https://github.com/vllm-project/vllm/commit/e87521626febe2763f997691d1599de4175f4324","tags":["x_refsource_MISC"]},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.26.0","name":"https://github.com/vllm-project/vllm/releases/tag/v0.26.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-209","lang":"en","description":"CWE-209: Generation of Error Message Containing Sensitive Information","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-13T14:50:03.539Z"},"source":{"advisory":"GHSA-hwrm-c4cx-rf4j","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-14T15:57:13.055942Z","id":"CVE-2026-73555","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-14T15:57:23.396Z"}}]}}}