medium5.3
CVE-2026-73555
vLLM: Unauthenticated Internal Path and Username Disclosure via Validation Error Messages
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | vllm | < 0.26.0 | 0.26.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Vllm | Vllm | before 0.26.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-hwrm-c4cx-rf4j
- https://github.com/vllm-project/vllm/security/advisories/GHSA-hwrm-c4cx-rf4j
- https://nvd.nist.gov/vuln/detail/CVE-2026-73555
- https://github.com/vllm-project/vllm/pull/46415
- https://github.com/vllm-project/vllm/commit/e87521626febe2763f997691d1599de4175f4324
- https://github.com/vllm-project/vllm/releases/tag/v0.26.0