Provide references for CVE-2021-22540.
Where can I find more information about CVE-2021-22540?
References are available at: https://github.com/dart-lang/sdk/security/advisories/GHSA-3rfv-4jvg-9522, https://github.com/dart-lang/sdk/commit/ce5a1c2392debce967415d4c09359ff2555e3588.