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Polygon discloses multiple security vulnerabilities in its PoS network, which have been fixed through two hard forks.

2026.08.30 09:38:11

Polygon has disclosed multiple security vulnerabilities affecting its Proof-of-Stake (PoS) network, targeting the Bor and Heimdall clients, which could lead to denial-of-service (DoS) attacks, validator resource exhaustion, and abnormal checkpoint and milestone processing. Fixes for these flaws have been deployed to the mainnet via the recently completed Austin and Kyoto hard forks. The most critical vulnerability resides in Heimdall, where attackers can craft special transactions to force validators to execute an excessive number of processing tasks, thereby disrupting network operations. The Austin hard fork also patched two DoS risks in Bor, which could have resulted in reduced block processing speeds or node crashes. Polygon noted that no exploitation of these vulnerabilities has been detected on the mainnet, and the team proactively completed the fixes before publicly disclosing technical details. All Polygon PoS nodes must run Bor v2.10.0, while validators and full nodes also need to upgrade to Heimdall v0.11.0; nodes still running older versions have fallen out of consensus and must update to rejoin the mainnet.

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