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CVE-2026-73555— vLLM: Unauthenticated Internal Path and Username Disclosure via Validation Error Messages

Quick assessment

Affected
vllm-project vllm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

vLLM是vLLM团队开源的一个适用于 LLM 的高吞吐量和内存高效推理和服务引擎。 vLLM 0.26.0之前版本存在信息泄露漏洞，该漏洞源于validation_exception_handler和sanitize_message处理不当，未移除traceback风格文件路径，可能导致未经身份验证的攻击者通过向/v1/chat/completions、/v1/completions、/tokenize和/detokenize发送畸形JSON请求，泄露操作系统用户名、主目录和虚拟环境路径、Python版

CVSS 5.3 · Medium EPSS 0.41% · P33

Affected Version Matrix 1

VendorProduct Version RangeStatus
vllm-project vllm < 0.26.0 affected
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I. Basic Information for CVE-2026-73555

Vulnerability Information
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Vulnerability Title
vLLM: Unauthenticated Internal Path and Username Disclosure via Validation Error Messages
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过错误消息导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
vLLM 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
vLLM是vLLM团队开源的一个适用于 LLM 的高吞吐量和内存高效推理和服务引擎。 vLLM 0.26.0之前版本存在信息泄露漏洞，该漏洞源于validation_exception_handler和sanitize_message处理不当，未移除traceback风格文件路径，可能导致未经身份验证的攻击者通过向/v1/chat/completions、/v1/completions、/tokenize和/detokenize发送畸形JSON请求，泄露操作系统用户名、主目录和虚拟环境路径、Python版
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vllm-project vllm < 0.26.0 -

II. Public POCs for CVE-2026-73555

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III. Intelligence Information for CVE-2026-73555

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Patches & Fixes for CVE-2026-73555 (2)

Vendor Advisories for CVE-2026-73555 (1)

Vendor Pages for CVE-2026-73555 (1)

Same Patch Batch · vllm-project · 2026-08-13 · 5 CVEs total

CVE-2026-73559 6.5 MEDIUM vLLM: Completion prompt lists fan out into unbounded engine requests
CVE-2026-73557 6.3 MEDIUM vLLM: Incomplete CVE-2025-62164 remediation can be bypassed by concurrent prompt parts
CVE-2026-73556 5.3 MEDIUM vLLM: ReDoS via structured_outputs.regex in the lm-format-enforcer backend (no compile tim
CVE-2026-73558 5.3 MEDIUM vLLM: Cross-User Data Leak Vulnerability

IV. Related Vulnerabilities

Same product: vllm
Same vendor: vllm-project
Same weakness: CWE-209

V. Comments for CVE-2026-73555

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