Polygon Fixes Security Flaws in Recent Hard Forks

Polygon has disclosed several previously private security vulnerabilities that could have disrupted its proof-of-stake network. The issues were addressed through two recent hard forks, Austin and Kyoto.

The vulnerabilities affected Polygon's Bor and Heimdall clients and included denial-of-service risks, validator resource exhaustion, and flaws affecting checkpoint and milestone processing.

The most severe issue involved Heimdall, where a specially crafted transaction could force validators to perform excessive processing work, potentially disrupting the network.