CVE-2026-73558

Published: Aug 13, 2026Modified: Sep 9, 2026

5.3

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

Exploitability: 1.6 / Impact: 3.6

Source: security-advisories@github.com (Secondary)

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.

Related CWEs

Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

References (6)

https://github.com/vllm-project/vllm/commit/451227cb3ff07989698fed982c2d3e4300257924

Source: security-advisories@github.com

https://github.com/vllm-project/vllm/issues/42860

Source: security-advisories@github.com

https://github.com/vllm-project/vllm/pull/49660

Source: security-advisories@github.com

https://github.com/vllm-project/vllm/releases/tag/v0.27.0

Source: security-advisories@github.com

https://github.com/vllm-project/vllm/security/advisories/GHSA-7m6h-x95x-82q5

Source: security-advisories@github.com

https://github.com/vllm-project/vllm/security/advisories/GHSA-7m6h-x95x-82q5

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

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