# CVE-2026-73555

## Summary

- **CVE ID:** CVE-2026-73555
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
- **CWE:** CWE-209
- **Published:** Aug 13, 2026
- **Last Modified:** Aug 14, 2026

## 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.

## Affected Products

- vllm-project — vllm (< 0.26.0)

## References

- [CNA](https://github.com/vllm-project/vllm/security/advisories/GHSA-hwrm-c4cx-rf4j)
- [CNA](https://github.com/vllm-project/vllm/pull/46415)
- [CNA](https://github.com/vllm-project/vllm/commit/e87521626febe2763f997691d1599de4175f4324)
- [CNA](https://github.com/vllm-project/vllm/releases/tag/v0.26.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 17.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._