Vulnerability in Vllm
CVE-2026-93841
vLLM through 0.29.0 contains a memory corruption vulnerability in the Triton _bincount_kernel where prompt token IDs index the penalty prompt-presence bitset without bounds checking against vocabulary size. Attackers can submit multimodal audio requests with tokens equal to vocabulary size, causing out-of-bounds writes that corrupt concurrent requests' sampler state and alter repetition penalty behavior.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (14.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/vllm-project/vllm/pull/49081 (issue-tracking, Patch, patch, Issue Tracking)
- github.com/vllm-project/vllm (Product, product)
- github.com/vllm-project/vllm/blob/v0.29.0/vllm/v1/worker/gpu/sample/penalties.py (Product, technical-description)
- github.com/vllm-project/vllm/blob/v0.29.0/vllm/v1/worker/gpu/sample/penalties.py (Product, technical-description)
- www.vulncheck.com/advisories/vllm-through-0.29.0-adjacent-request-sampler-state… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-93841?
- CVE-2026-93841 is a low-severity vulnerability in Vllm, classified under Improper Validation of Array Index. CVSS score: 3.7/10. Published 2026-09-18.
- How severe is CVE-2026-93841?
- Low severity. CVSS v3 base score is 3.7 out of 10.