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.
{ "nvd_published_at": null, "cwe_ids": [ "CWE-662", "CWE-787" ], "severity": "HIGH", "github_reviewed": true, "github_reviewed_at": "2021-08-19T18:51:18Z" }