An invalid free in Thrift's table-based serialization can cause the application to crash or potentially result in code execution or other undesirable effects. This issue affects Facebook Thrift prior to v2021.02.22.00.
https://www.facebook.com/security/advisories/cve-2021-24028
https://github.com/facebook/fbthrift/commit/bfda1efa547dce11a38592820916db01b05b9339