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Polygon discloses security flaws fixed in recent hard forks

Polygon has revealed previously undisclosed security vulnerabilities in its proof-of-stake network, which were fixed via the recent Austin and Kyoto hard forks. The flaws, affecting the Bor and Heimdall clients, included denial-of-service risks, validator resource exhaustion, and issues with checkpoint processing. The most severe involved a Heimdall vulnerability where a malicious transaction could overload validators and disrupt the network. Polygon stated the fixes were deployed privately and tested before mainnet activation, with no observed exploits. Nodes must upgrade to Bor v2.10.0 and Heimdall v0.11.0 to remain in consensus.

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