Polygon disclosed several previously private security vulnerabilities affecting its Bor and Heimdall clients, which were fixed through the Austin and Kyoto hard forks before any public disclosure. The most critical flaw targeted Heimdall, where a specially crafted transaction could force validators to perform excessive processing work, potentially disrupting the network. The Austin hard fork also resolved two denial-of-service risks in Bor that could have slowed block processing or caused nodes to crash. No exploitation of these vulnerabilities was observed on mainnet. Nodes running older versions must upgrade to Bor v2.10.0 and Heimdall v0.11.0 to rejoin the canonical network.
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