Affected versions of this crate contain a soundness issue in the IterMut iterator implementation. The IterMut::next and IterMut::next_back methods temporarily create an exclusive reference to the key when dereferencing the internal node pointer.
This invalidates the shared pointer held by the internal HashMap, violating Stacked Borrows rules.
{
"severity": "LOW",
"github_reviewed": true,
"nvd_published_at": null,
"cwe_ids": [
"CWE-476"
],
"github_reviewed_at": "2026-01-07T20:38:57Z"
}