vulnerability / NVI-00017696 / Revision 1
jxl-grid on 32-bit platforms has an out-of-bounds writes due to integer overflow
GitHub lists this reviewed advisory for jxl-grid. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
7.3 high
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
jxl-grid
source listed<= 0.6.1
### Summary On 32-bit platforms, decoding a crafted image may lead to out-of-bounds writes due to integer overflow in length calculation. ### 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. **Hu
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
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04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
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- GHSA-5pmv-rx8r-wmv5 ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
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