Polygon discloses previously undisclosed security flaws fixed via hard forks

Polygon disclosed multiple previously undisclosed security vulnerabilities that it said were resolved through two recent hard forks. The flaws could have affected block processing as well as the validation and consensus process on the Polygon proof-of-stake network. The vulnerabilities were found in the Bor and Heimdall clients and included denial-of-service issues, excessive resource consumption affecting the validator set, and problems related to checkpoint and milestone processing. Polygon said the issues were addressed through the Austin and Kyoto hard forks.