GHSA-wp34-mqw5-jj85

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GHSA-wp34-mqw5-jj85

Summary: Use after free in nano_arena

Details: Affected versions of this crate assumed that Borrow<Idx> was guaranteed to return the same value on .borrow(). The borrowed index value was used to retrieve a mutable reference to a value. If the Borrow<Idx> implementation returned a different index, the split arena would allow retrieving the index as a mutable reference creating two mutable references to the same element. This violates Rust's aliasing rules and allows for memory safety issues such as writing out of bounds and use-after-frees. The flaw was corrected in commit `6b83f9d` by storing the .borrow() value in a temporary variable.

References: https://nvd.nist.gov/vuln/detail/CVE-2021-28032, https://github.com/bennetthardwick/nano-arena/issues/1, https://github.com/bennetthardwick/nano-arena/commit/6b83f9d0708337a9f8b709c1624a8587021ceba2, https://github.com/bennetthardwick/nano-arena, https://rustsec.org/advisories/RUSTSEC-2021-0031.html