RUSTSEC-2020-0122: beef::Cow lacks a Sync bound on its Send trait allowing for data races

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beef::Cow lacks a Sync bound on its Send trait allowing for data races

Details
Package	beef
Version	0.4.4
URL	maciejhirsz/beef#37
Date	2020-10-28
Patched versions	>=0.5.0

Affected versions of this crate did not have a T: Sync bound in the Send impl for Cow<'_, T, U>. This allows users to create data races by making Cow contain types that are (Send && !Sync) like Cell<_> or RefCell<_>.

Such data races can lead to memory corruption.

The flaw was corrected in commit d1c7658 by adding trait bounds T: Sync and T::Owned: Send to the Send impl for Cow<'_, T, U>.

See advisory page for additional details.