CVE-2026-73558

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.