VULNERABILITY INTELLIGENCE

CVE-2026-73555

CVSS score5.3 MEDIUM

EPSS probability0.41%

CISA KEVNot currently listed

Published2026-08-13

Last modified2026-10-02

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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.

Weakness classification

CWE-209: Generation of Error Message Containing Sensitive Information

Primary references

security-advisories@github.com — Patch
security-advisories@github.com — Issue Tracking, Patch
security-advisories@github.com — Release Notes
security-advisories@github.com — Mitigation, Vendor Advisory