Polygon fixes validator and execution vulnerabilities in two hard forks
Polygon disclosed a set of previously private security fixes applied to its proof-of-stake network via two coordinated hard forks named Austin and Kyoto. Austin patched Bor, the execution client, to remove two denial-of-service paths that could slow block processing or crash nodes. Kyoto fixed wider Heimdall issues, including crafted transactions that could force validators into excessive processing; limits were added to reject overly costly transactions. Polygon said no mainnet exploitation was observed and that fixes were tested privately before activation. Nodes that did not upgrade fell out of consensus and now must update to rejoin the network.
Polygon required mandatory Bor v2.10.0 and Heimdall v0.11.0 upgrades
Context
Developers found several security flaws in two node clients. They deployed fixes privately and then activated two hard forks. Next, operators must upgrade or their nodes fall out of consensus.
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