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vLLM EUVDEUVD-2026-83285

| CVE-2026-93841 MEDIUM
Improper Validation of Array Index (CWE-129)
2026-09-18 VulnCheck GHSA-q9hm-g73w-q6wp
6.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
3.7 LOW

Network-reachable and unauthenticated (AV:N/PR:N) but requires concurrent-request timing to corrupt a neighbor (AC:H); impact is low integrity only (I:L), with no confidentiality or availability effect.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Sep 18, 2026 - 20:03 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Out-of-bounds writes in the Triton bincount sampling kernel of vLLM through 0.29.0 let unauthenticated remote clients corrupt a neighboring request's repetition-penalty state by submitting multimodal audio input that contains a token ID equal to the model's vocabulary size. The root cause is an unvalidated array index (CWE-129): prompt and output token IDs are used to index the penalty prompt-presence bitset and output bin counts without any bounds check against vocab_size, so a one-past-the-end token spills into the adjacent request's mask/count rows. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Requires a network-reachable vLLM instance (through 0.29.0) serving a multimodal model that accepts audio token inputs, running on a CUDA GPU with compute capability >= 8.0 (the vulnerable code is a Triton kernel, per the patch's test skip conditions). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a moderate, integrity-only issue rather than a top priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the upstream fix for this issue, which is tracked in vLLM PR #49081 (https://github.com/vllm-project/vllm/pull/49081) and adds a regression test for the out-of-bounds prompt-presence bitset write; because the patch is currently delivered via that PR rather than a confirmed tagged release, upgrade only to a vLLM release that explicitly includes it - the released patched version is not independently confirmed at time of analysis, so verify the fix is present in the target build before relying on it. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-83285 vulnerability details – vuln.today

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