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CVE-2026-73558— vLLM: Cross-User Data Leak Vulnerability

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是vLLM团队开源的一个适用于 LLM 的高吞吐量和内存高效推理和服务引擎。 vLLM 0.27.0之前版本存在数字错误漏洞，该漏洞源于activation_kernels.cu中blockIdx.x 2 d存在整数溢出，可能导致同一推理批次中其他请求获取另一个用户的部分或全部推理结果。

CVSS 5.3 · Medium EPSS 0.41% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
vllm-project vllm < 0.27.0 affected
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I. Basic Information for CVE-2026-73558

Vulnerability Information
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Vulnerability Title
vLLM: Cross-User Data Leak Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
vLLM is an inference and serving engine for large language models. Prior to 0.27.0, an integer overflow in blockIdx.x * 2 * d in activation_kernels.cu can cause act_and_mul_kernel to consume another batched user's input, allowing a request processed in the same inference batch to receive a partial or complete copy of another user's inference result. This issue is fixed in version 0.27.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
vLLM 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
vLLM是vLLM团队开源的一个适用于 LLM 的高吞吐量和内存高效推理和服务引擎。 vLLM 0.27.0之前版本存在数字错误漏洞，该漏洞源于activation_kernels.cu中blockIdx.x * 2 * d存在整数溢出，可能导致同一推理批次中其他请求获取另一个用户的部分或全部推理结果。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vllm-project vllm < 0.27.0 -

II. Public POCs for CVE-2026-73558

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III. Intelligence Information for CVE-2026-73558

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Patches & Fixes for CVE-2026-73558 (2)

Vendor Advisories for CVE-2026-73558 (1)

Other References for CVE-2026-73558 (1)

Same Patch Batch · vllm-project · 2026-08-13 · 5 CVEs total

CVE-2026-73559 6.5 MEDIUM vLLM: Completion prompt lists fan out into unbounded engine requests
CVE-2026-73557 6.3 MEDIUM vLLM: Incomplete CVE-2025-62164 remediation can be bypassed by concurrent prompt parts
CVE-2026-73555 5.3 MEDIUM vLLM: Unauthenticated Internal Path and Username Disclosure via Validation Error Messages
CVE-2026-73556 5.3 MEDIUM vLLM: ReDoS via structured_outputs.regex in the lm-format-enforcer backend (no compile tim

IV. Related Vulnerabilities

Same product: vllm
Same vendor: vllm-project
Same weakness: CWE-190

V. Comments for CVE-2026-73558

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