Out-of-bounds writes due to integer overflow in jxl-grid on 32-bit platforms

{
  "id": "b65df30f5e9bac50e91aa56af4c4b314feca3b7b473b3928bcc1f2af10b7bd67",
  "url": "https://osv.dev/vulnerability/RUSTSEC-2026-0151",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Out-of-bounds writes due to integer overflow in jxl-grid on 32-bit platforms",
    "summary": "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::::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 “sm",
    "evidence": "osv:RUSTSEC-2026-0151",
    "products": [
      {
        "name": {
          "value": "jxl-grid",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.6.2",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "RUSTSEC-2026-0151",
      "aliases": [
        "CVE-2026-52834",
        "GHSA-5pmv-rx8r-wmv5",
        "RUSTSEC-2026-0151"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0.0.0-0"
                },
                {
                  "fixed": "0.6.2"
                }
              ]
            }
          ],
          "package": {
            "name": "jxl-grid",
            "purl": "pkg:cargo/jxl-grid",
            "ecosystem": "crates.io"
          },
          "database_specific": {
            "cvss": null,
            "source": "https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0151.json",
            "categories": [
              "memory-corruption"
            ],
            "informational": null
          },
          "ecosystem_specific": {
            "affects": {
              "os": [],
              "arch": [],
              "functions": []
            },
            "affected_functions": null
          }
        }
      ],
      "modified": "2026-10-12T18:00:13.554286599Z",
      "provider": "osv",
      "references": [
        "https://crates.io/crates/jxl-grid",
        "https://rustsec.org/advisories/RUSTSEC-2026-0151.html",
        "https://github.com/tirr-c/jxl-oxide/commit/3986dadd3926a95656a642e74a0702d52f5c92e2"
      ],
      "provider_metadata": {
        "license": "CC0-1.0"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-52834",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 306444,
  "published_at": "2026-05-29T12:00:00+00:00"
}