| Component | vLLM |
| Severity | medium (CVSS 5.9) |
| CVSS vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Published (NVD) | 2026-09-26 |
| Last modified | 2026-10-06 |
| Affected versions | vllm >= 0.22.0, < 0.24.0 |
| Fixed in | 0.24.0 |
| Weakness | CWE-20 |
| CISA KEV | not listed |
NVD description
vLLM versions 0.22.0 through 0.23.0 fail to validate stop_token_ids against vocabulary bounds in Rust HTTP and gRPC frontends, allowing out-of-vocabulary token IDs to reach MinTokensLogitsProcessor. Attackers can submit requests with min_tokens greater than zero and out-of-vocabulary stop_token_ids to trigger CUDA tensor indexing failures that leave EngineCore in a fatal state requiring service restart.
What to do
- Upgrade vLLM to
0.24.0or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-100652
- https://github.com/vllm-project/vllm/security/advisories/GHSA-qff2-492f-9fm4
- https://www.vulncheck.com/advisories/vllm-0.22.0-through-0.23.0-denial-of-service-via-stop-token-ids
Read more
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