advisory-db/crates/conquer-once/RUSTSEC-2020-0101.md

[advisory]
id = "RUSTSEC-2020-0101"
package = "conquer-once"
aliases = ["CVE-2020-36208", "GHSA-3jc5-5hc5-33gj"]
cvss = "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
date = "2020-12-22"
url = "https://github.com/oliver-giersch/conquer-once/issues/3"
categories = ["memory-corruption", "thread-safety"]
keywords = ["concurrency"]

[versions]
patched = [">= 0.3.2"]
unaffected = []

conquer-once's OnceCell lacks Send bound for its Sync trait.

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.