RUSTSEC-2026-0254
Panic-safety unsoundness in `Chunk` and `InlineArray` (use-after-free / double-free)
Several methods in sp-sized-chunks drop elements before updating the container's length/boundary metadata. If an element's Drop panics during the drop, the metadata update is skipped, so the container still treats the already-dropped elements as live. When the container is later dropped, its own Drop re-visits those slots and drops the freed elements again — a use-after-free / double-free reachable from safe Rust.
sp-sized-chunks is a fork of sized-chunks (companion advisory filed separately) and carries the same bug. The repository is archived and the crate is still on 0.1.0 with no fix available.
Impact
- CWE-415 (Double Free): the same allocation is freed twice (e.g. an element holding
Box<T>). - CWE-416 (Use-After-Free): an element reads its own freed allocation during
Drop(e.g.String) — confirmed under AddressSanitizer.
All are reachable from safe Rust via catch_unwind with element types whose Drop can panic.
What each source reports
OSV No score
Panic-safety unsoundness in `Chunk` and `InlineArray` (use-after-free / double-free)
Several methods in sp-sized-chunks drop elements before updating the container's length/boundary metadata. If an element's Drop panics during the drop, the metadata update is skipped, so the container still treats the already-dropped elements as live. When the container is later dropped, its own Drop re-visits those slots and drops the freed elements again — a use-after-free / double-free reachable from safe Rust.
sp-sized-chunks is a fork of sized-chunks (companion advisory filed separately) and carries the same bug. The repository is archived and the crate is still on 0.1.0 with no fix available.
Impact
- CWE-415 (Double Free): the same allocation is freed twice (e.g. an element holding
Box<T>). - CWE-416 (Use-After-Free): an element reads its own freed allocation during
Drop(e.g.String) — confirmed under AddressSanitizer.
All are reachable from safe Rust via catch_unwind with element types whose Drop can panic.
- Record
RUSTSEC-2026-0254- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
sp-sized-chunkscrates.io |
0.0.0-0 and later | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
RUSTSEC-2026-0254 is a vulnerability with no CVSS score yet in sp-sized-chunks, published August 11, 2026. No source lists public exploit code. No source names a fixed version.