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CVE-2026-52834 high CVSS 7.3

Vulnerability in jxl-grid (CVE-2026-52834)

Summary

Vulnerability in jxl-grid (CVE-2026-52834). Risk of unauthorized operations or information disclosure. Exploitable via usize. Mitigation: upgrade to 0.6.2 or later.

Original description

The description as published by the source.

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:

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 AlignedGrids in modular/VarDCT/filter paths and later writes through mutable subgrid…

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-52834 has been found in jxl-grid.
Attackers can target a specific entry point like usize over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.3/10.
What to do: upgrade jxl-grid to 0.6.2 or later.
If unsure, ask your IT team or search "jxl-grid CVE-2026-52834" on the vendor's site.

CVE-2026-52834 (jxl-grid) — CWE-122 / CVSS v3 7.3
Attack vector: local / unauthenticated / no user interaction
Attack surface: usize / AlignedGrid
Patched: 0.6.2 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-122) exists in jxl-grid. Attackers reach the vulnerable code path via usize without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of jxl-grid. Attack surface: usize / AlignedGrid.

🔥 Severity

Severity: High (CVSS 7.3/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 0.6.2.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'jxl-grid' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'jxl-grid' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で jxl-grid を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade jxl-grid to 0.6.2

    ステージング環境で 0.6.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

crates.io jxl-grid
[{"type":"SEMVER","events":[{"introduced":"0.0.0-0"},{"fixed":"0.6.2"}]}]
rust jxl-grid
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.2"}]}]

References

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