ChainCatcher report, according to CryptoSlate, Polygon Labs has issued an emergency notice: Polygon PoS nodes running outdated versions of Bor or Heimdall have fallen out of consensus following the activation of the Austin and Kyoto hard forks and must be upgraded to catch up with the network. Austin was activated at mainnet block 91,949,700 and requires Bor v2.1.0 or higher; Kyoto was activated at height 51,533,000 and requires Heimdall v0.11.0 or higher. Austin addresses two types of Bor resource exhaustion risks: L1-to-L2 bridge state synchronization events not counted toward gas limits may slow block processing; unbounded TxDependency field size may cause peer node crashes. Kyoto fixes vulnerabilities including deep-nested message attacks, fee token scanning, and checkpoint signature recovery. Both hard forks are pure binary upgrades requiring no state migration; nodes that did not fork do not need to resync. Operators of old clients should upgrade and, if necessary, restore synchronization under Polygon’s guidance.
Polygon Labs Urges Node Operators to Upgrade Following the Austin and Kyoto Hard Forks
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Summary
Polygon Labs has issued an urgent upgrade notice for node operators following the activation of the Austin and Kyoto hard forks. Nodes running outdated versions of Bor or Heimdall are no longer in consensus and must upgrade to remain synchronized. The Austin hard fork, which activates at block 91,949,900, requires Bor v2.1.0 or higher to mitigate risks of resource exhaustion. The Kyoto hard fork, at block 51,533,000, requires Heimdall v0.11.0 or higher to address deep nested message attacks and checkpoint vulnerabilities. Both upgrades impact block propagation and are binary-only, requiring no state migration. Full node operators are strongly encouraged to upgrade immediately and follow Polygon’s guidance for resynchronization if necessary.
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