CVE-2026-73555vLLM: Unauthenticated Internal Path and Username Disclosure via Validation Error Messages
Updated under an hour ago ()
Does this affect you?
It affects vllm-project vllm and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-209
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Aug 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
vllm-project vllm vllm_project:vllm (from the name) | before 0.26.0 | CNA record |
vllm vllm vllm:vllm | before 0.26.0 | NVD |
References
- https://github.com/vllm-project/vllm/security/advisories/GHSA-hwrm-c4cx-rf4jx-refsource-confirm, mitigation, vendor-advisory
- https://github.com/vllm-project/vllm/pull/46415x-refsource-misc, issue-tracking, patch
- https://github.com/vllm-project/vllm/commit/e87521626febe2763f997691d1599de4175f4324x-refsource-misc, patch
- https://github.com/vllm-project/vllm/releases/tag/v0.26.0x-refsource-misc, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.