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opencv/modules/core/include/opencv2
Anshu c7732e1043 Merge pull request #28397 from 0AnshuAditya0:fix-simd-oob-read-28396
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
2026-03-27 15:40:09 +03:00
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