Provide references for CVE-2021-21278.
Where can I find more information about CVE-2021-21278?
References are available at: https://github.com/DIYgod/RSSHub/security/advisories/GHSA-pgjj-866w-fc5c, https://github.com/DIYgod/RSSHub/commit/7f1c43094e8a82e4d8f036ff7d42568fed00699d, https://www.npmjs.com/package/rsshub.