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CVE-2026-93841— vLLM through 0.29.0 Adjacent-Request Sampler State Corruption via Unvalidated Prompt Token IDs

Quick assessment

Affected
vllm-project vllm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

vLLM 至 0.29.0 版本存在一个内存损坏漏洞，位于 Triton 的 中。该漏洞表现为：提示词 token ID 在对惩罚（penalty）相关的提示词存在位图（prompt-presence bitset）进行索引时，未对词表大小进行边界检查。攻击者可以提交多模态音频请求，其中包含等于词表大小的 token，从而引发越界写操作，导致并发请求的采样器（sampler）状态被破坏，并改变重复惩罚（repetition penalty）的行为。

CVSS 3.7 · Low

Affected Version Matrix 1

VendorProduct Version RangeStatus
vllm-project vllm ≤ 0.29.0 affected
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I. Basic Information for CVE-2026-93841

Vulnerability Information
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Vulnerability Title
vLLM through 0.29.0 Adjacent-Request Sampler State Corruption via Unvalidated Prompt Token IDs
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vllm-project vllm 0 ~ 0.29.0 -

II. Public POCs for CVE-2026-93841

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III. Intelligence Information for CVE-2026-93841

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Patches & Fixes for CVE-2026-93841 (1)

Other References for CVE-2026-93841 (4)

Same Patch Batch · vllm-project · 2026-09-18 · 3 CVEs total

CVE-2026-93592 7.5 HIGH vLLM before 0.28.0 Denial of Service via negative token ID
CVE-2026-93840 3.7 LOW vLLM before 0.29.0 Cross-Request Logits Corruption via allowed_token_ids

IV. Related Vulnerabilities

Same product: vllm
Same vendor: vllm-project
Same weakness: CWE-129

V. Comments for CVE-2026-93841

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