CVE-2020-36208: Data races in conquer-once

August 25, 2021 (updated June 13, 2023)

Affected versions of conquer-once implements Sync for its OnceCell type without restricting it to Sendable types.

This allows non-Send but Sync types such as MutexGuard to be sent across threads leading to undefined behavior and memory corruption in concurrent programs.

The issue was fixed by adding a Send constraint to OnceCell.

References

github.com/advisories/GHSA-3jc5-5hc5-33gj
github.com/oliver-giersch/conquer-once
github.com/oliver-giersch/conquer-once/issues/3
nvd.nist.gov/vuln/detail/CVE-2020-36208
rustsec.org/advisories/RUSTSEC-2020-0101.html

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