RUSTSEC-2026-0282
Double free in `AlignedBox<[T]>::realloc_with_default` when an element's `Drop` panics
Shrinking an AlignedBox<[T]> takes ownership of the buffer out of
self.container with ManuallyDrop::take, destroys the elements past the new
length, and only then commits the new Box back into self.container.
ManuallyDrop::take moves ownership but not the bits, so until that commit
self.container still points at the original buffer.
T::drop runs inside the destruction loop and is user code — T carries no
bound that would exclude a panicking Drop. If it unwinds, the commit is
skipped and self.container is left pointing at the buffer whose tail has
already been destroyed. AlignedBox's own destructor then reconstructs a Box
from that pointer, drops every element again and deallocates — a double free
(CWE-415) / use-after-free (CWE-416) reachable from safe Rust.
Growing the slice destroys nothing and is unaffected, as is
realloc_with_value, which requires T: Copy and therefore a Drop that
cannot run.
Mitigation
Update to 0.3.1.
What each source reports
OSVNo score
Double free in `AlignedBox<[T]>::realloc_with_default` when an element's `Drop` panics
Shrinking an AlignedBox<[T]> takes ownership of the buffer out of
self.container with ManuallyDrop::take, destroys the elements past the new
length, and only then commits the new Box back into self.container.
ManuallyDrop::take moves ownership but not the bits, so until that commit
self.container still points at the original buffer.
T::drop runs inside the destruction loop and is user code — T carries no
bound that would exclude a panicking Drop. If it unwinds, the commit is
skipped and self.container is left pointing at the buffer whose tail has
already been destroyed. AlignedBox's own destructor then reconstructs a Box
from that pointer, drops every element again and deallocates — a double free
(CWE-415) / use-after-free (CWE-416) reachable from safe Rust.
Growing the slice destroys nothing and is unaffected, as is
realloc_with_value, which requires T: Copy and therefore a Drop that
cannot run.
Mitigation
Update to 0.3.1.
- Record
RUSTSEC-2026-0282- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
aligned_boxcrates.io | 0.0.0-0 up to 0.3.1 | 0.3.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
RUSTSEC-2026-0282 is a vulnerability with no CVSS score yet in aligned_box, published September 9, 2026. No source lists public exploit code. Fixed in aligned_box 0.3.1.