Vulnerability in Vllm
CVE-2026-44222
vLLM is an inference and serving engine for large language models (LLMs). From 0.6.1 to before 0.20.0, there is a a Token Injection vulnerability in vLLM’s multimodal processing. Unauthenticated, text-only prompts that spell special tokens are interpreted as control. Image and video placeholder sequences supplied without matching data cause vLLM to index into empty grids during input-position computation, raising an unhandled IndexError and terminating the worker or degrading availability. Multimodal paths that rely on image_grid_thw/video_grid_thw are affected. This vulnerability is fixed in 0.20.0.
Published · last modified .
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
EPSS: 0.005 (37.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000
Affected products
- Vllm
- Vllm-Project Vllm — versions >= 0.6.1, < 0.20.0
Weakness classification (CWE)
References
- github.com/vllm-project/vllm/issues/32656 (Issue Tracking)
- github.com/vllm-project/vllm/security/advisories/GHSA-hpv8-x276-m59f (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-44222?
- CVE-2026-44222 is a medium-severity vulnerability in Vllm, classified under Improper Validation of Array Index. CVSS score: 6.5/10. Published 2026-05-12.
- How severe is CVE-2026-44222?
- Medium severity. CVSS v3 base score is 6.5 out of 10.