{"schema_version":"1.9.0","id":"RUSTSEC-2026-0151","published":"2026-05-29T12:00:00Z","modified":"2026-10-12T18:00:13.554286599Z","aliases":["CVE-2026-52834","GHSA-5pmv-rx8r-wmv5"],"summary":"Out-of-bounds writes due to integer overflow in jxl-grid on 32-bit platforms","details":"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.\n\n### Details & PoC\n\nThe test listed below fail under miri with command `cargo +nightly miri test --release -p jxl-grid`\n\nOr you can use Address Sanitizer, which ignores Rust-specific UB like aliasing but still flags out-of-bounds accesses:\n\n`RUSTFLAGS=-Zsanitizer=address cargo +nightly test -Zbuild-std -p jxl-grid --release --target x86_64-unknown-linux-gnu`\n\nThe following tests should be appended to `crates/jxl-grid/src/test/subgrids.rs`:\n\n```rust\nmod miri_ub {\n    use super::*;\n\n    // `AlignedGrid::with_alloc_tracker` computes `width * height` unchecked. In release, overflow\n    // can create a tiny backing buffer for huge logical dimensions.\n    #[test]\n    fn aligned_grid_dimension_product_overflows() {\n        let width = usize::MAX / 2 + 1;\n        let mut grid = AlignedGrid::<u8>::with_alloc_tracker(width, 2, None).unwrap();\n        let mut subgrid = grid.as_subgrid_mut();\n        *subgrid.get_mut(0, 1) = 1;\n        std::hint::black_box(grid);\n    }\n}\n```\n\nThis issue can be reachable through decoding a crafted image in two ways:\n\n1. **Huge actual frame**\n   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.\n\n2. **Huge canvas plus tiny cropped frame**\n   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()`.","affected":[{"package":{"name":"jxl-grid","ecosystem":"crates.io","purl":"pkg:cargo/jxl-grid"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.0.0-0"},{"fixed":"0.6.2"}]}],"ecosystem_specific":{"affected_functions":null,"affects":{"arch":[],"functions":[],"os":[]}},"database_specific":{"categories":["memory-corruption"],"cvss":null,"informational":null,"source":"https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0151.json"}}],"references":[{"type":"PACKAGE","url":"https://crates.io/crates/jxl-grid"},{"type":"ADVISORY","url":"https://rustsec.org/advisories/RUSTSEC-2026-0151.html"},{"type":"WEB","url":"https://github.com/tirr-c/jxl-oxide/commit/3986dadd3926a95656a642e74a0702d52f5c92e2"}],"database_specific":{"license":"CC0-1.0"}}