Affected versions of this crate did not guard against potential panics that may happen from user-provided functions T::default() and T::drop().

Panic within T::default() leads to dropping uninitialized T, when it is invoked from common::Slice::<T, H>::new(). Panic within T::drop() leads to double drop of T, when it is invoked either from common::SliceVec::<T, H>::resize_with() or common::SliceVec::<T, H>::resize()

Either case causes memory corruption in the heap memory.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-29931
• ibabushkin/arenavec#1
• https://rustsec.org/advisories/RUSTSEC-2021-0040.html