Vulnerability in Vllm-Project Vllm
CVE-2026-116181
vLLM from 0.20.1 before 0.29.0 contains an improper input validation vulnerability that allows remote attackers to crash the engine by supplying out-of-vocabulary stop_token_ids. Attackers can send OpenAI chat, completion, generate, or batch requests with invalid IDs to terminate the engine or write outside the V2 runner's logits buffer.
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/vllm-project/vllm/security/advisories/GHSA-w9r6-29q4-pvpr (vendor-advisory)
- www.vulncheck.com/advisories/vllm-0.20.1-before-0.29.0-dos-and-gpu-out-of-bound… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116181?
- CVE-2026-116181 is a medium-severity vulnerability in Vllm-Project Vllm, classified under Improper Validation of Array Index. CVSS score: 6.5/10. Published 2026-10-25.
- How severe is CVE-2026-116181?
- Medium severity. CVSS v3 base score is 6.5 out of 10.