RUSTSEC-2026-0151

On 32-bit platforms, decoding a crafted image may lead to out-of-bounds writes due to integer overflow in length calculation. This could allow arbitrary code execution.

### Details & PoC

The test listed below fail under miri with command `cargo +nightly miri test --release -p jxl-grid`

Or you can use Address Sanitizer, which ignores Rust-specific UB like aliasing but still flags out-of-bounds accesses:

`RUSTFLAGS=-Zsanitizer=address cargo +nightly test -Zbuild-std -p jxl-grid --release --target x86_64-unknown-linux-gnu`

The following tests should be appended to `crates/jxl-grid/src/test/subgrids.rs`:

```rust mod miri_ub { use super::*;

// `AlignedGrid::with_alloc_tracker` computes `width * height` unchecked. In release, overflow // can create a tiny backing buffer for huge logical dimensions. #[test] fn aligned_grid_dimension_product_overflows() { let width = usize::MAX / 2 + 1; let mut grid = AlignedGrid::<u8>::with_alloc_tracker(width, 2, None).unwrap(); let mut subgrid = grid.as_subgrid_mut(); *subgrid.get_mut(0, 1) = 1; std::hint::black_box(grid); } } ```

This issue can be reachable through decoding a crafted image in two ways:

1. **Huge actual frame** A frame such as `65536 x 65536` passes the current frame area limit (`2^32 <= 2^40`) but overflows `usize` element count on 32-bit. Rendering then allocates too-small `AlignedGrid`s in modular/VarDCT/filter paths and later writes through mutable subgrids.

2. **Huge canvas plus tiny cropped frame** This is the more practical “small payload, huge logical output” case. A bitstream-controlled frame crop can be tiny, but if the canvas/default requested region is huge, composition can allocate an output grid sized to the canvas/ROI at crates/jxl-render/src/blend.rs. That is bitstream frame cropping, not API crop. With a 32-bit target and a full requested image region whose area overflows, this can happen through ordinary `render_frame()`.