An issue was discovered in the bunch crate through 2020-11-12 for Rust.
Affected versions of this crate unconditionally implements Send/Sync for Bunch<T>.
This allows users to insert T: !Sync to Bunch<T>. It is possible to create a data race to a T: !Sync by invoking the Bunch::get() API (which returns &T) from multiple threads. It is also possible to send T: !Send to other threads by inserting T inside Bunch<T> and sending Bunch<T> to another thread, allowing to create a data race by inserting types like T = Rc<_>.

Such data races can lead to memory corruption.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-36450
• https://rustsec.org/advisories/RUSTSEC-2020-0130.html
• krl/bunch#1
• https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/bunch/RUSTSEC-2020-0130.md