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

jxl-oxide is a pure Rust implementation of a JPEG XL decoder. Prior to jxl-grid 0.6.2, decoding a crafted JPEG XL image on a 32-bit platform can overflow length calculations in AlignedGrid::with_alloc_tracker and related grid and subgrid arithmetic. A 65536 x 65536 frame can pass the frame-area limit while overflowing the usize element count, causing modular, VarDCT, or filter rendering paths to allocate a backing buffer smaller than the logical grid. A tiny bitstream-controlled cropped frame combined with a huge canvas or requested region can also reach the vulnerable composition path in crates/jxl-render/src/blend.rs through ordinary render_frame(). Later mutable subgrid and raw-pointer operations can then perform attacker-controlled out-of-bounds writes, causing memory corruption, denial of service, or arbitrary code execution. This issue is fixed in jxl-grid version 0.6.2.

Source published

19 Aug 2026 14:55:32 UTC

Source modified

19 Aug 2026 18:19:05 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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CVSS 3.1 · 7.3 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H