# CVE-2026-52834

## Summary

- **CVE ID:** CVE-2026-52834
- **Severity:** HIGH
- **CVSS Score:** 7.3 (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H)
- **CWE:** CWE-122, CWE-131, CWE-190
- **Published:** Aug 19, 2026
- **Last Modified:** Aug 19, 2026

## Description

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.

## Affected Products

- tirr-c — jxl-oxide (< 0.12.6)
- tirr-c — jxl-grid (< 0.6.2)

## References

- [CNA](https://github.com/tirr-c/jxl-oxide/security/advisories/GHSA-5pmv-rx8r-wmv5)
- [CNA](https://github.com/tirr-c/jxl-oxide/commit/3986dadd3926a95656a642e74a0702d52f5c92e2)
- [CNA](https://github.com/tirr-c/jxl-oxide/releases/tag/0.12.6)
- [CNA](https://rustsec.org/advisories/RUSTSEC-2026-0151.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.13%
- **EPSS Percentile:** 3.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._