CVE-2026-73555

MEDIUM 5.3

vLLM: Unauthenticated Internal Path and Username Disclosure via Validation Error Messages

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-209
Vendor	vllm-project
Product	vllm
Published	Aug 13, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

vllm-project / vllm

< 0.26.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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