---
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: 0.00419
epssPercentile: 0.33701
aliases:
  - GHSA-hwrm-c4cx-rf4j
  - PYSEC-2026-3937
ecosystem: pip
ingestedAt: '2026-09-04T22:28:54.950Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-73555)

Affected packages:

- `vllm < 0.26.0`

Patched in:

- `vllm 0.26.0`

Source: https://github.com/advisories/GHSA-hwrm-c4cx-rf4j