RUSTSEC-2020-0111 may_queue's Queue lacks Send/Sync bound for its Send/Sync trait.

Affected versions of mayqueue implements Send/Sync for its Queue type without restricting it to Sendable types and Syncable types. This allows non-Sync types such as Cell to be shared across threads leading to undefined behavior and memory corruption in concurrent programs...

WS-2020-0189

Affected versions of futures-rs had a Send/Sync implementation for MappedMutexGuard that only considered variance on T, while MappedMutexGuard dereferenced to U. This could of led to data races in safe Rust code when a closure used in MutexGuard::map returns U that is unrelated to T. The issue wa...