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Fixes #28396 : out-of-bounds read in SIMD type conversion #28397 Fixes #28396 Fixes #27080 The vx_load_expand function in WASM intrinsics was using wasm_v128_load which always loads a full 128-bit register (16 bytes), even when the function only needed 8 elements. For example, when converting uint8 to float32: - vx_load_expand needs 8 uint8 elements - But wasm_v128_load reads 16 bytes from memory - This causes an 8-byte out-of-bounds read ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [x] There is a reference to the original bug report and related work - [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [ ] The feature is well documented and sample code can be built with the project CMake