# Polygon fixes security vulnerabilities in recent hard forks Network security ensured through latest updates - **Source:** [Cointelegraph.com News](https://brifing.si/source/2e81e982-0137-4db0-8ac2-351f37085775) - **Published:** 2026-08-29 - **Topic:** [Finance](https://brifing.si/c/finance) - **Original article:** - **On Brifing:** https://brifing.si/s/40420384-6046-4cc8-98ad-32176f6aaa2c ## Security vulnerabilities identified Polygon Labs' Validators Support Team discovered critical security flaws in Polygon's proof-of-stake network. These vulnerabilities affected Bor and Heimdall clients, including denial-of-service risks, validator resource exhaustion, and checkpoint processing errors. No evidence was found of these flaws being exploited on the mainnet. ## Austin hard fork details The Austin hard fork addressed two critical denial-of-service risks in the Bor client. These risks could slow down block processing or cause nodes to crash. The hard fork was first privately deployed and tested before being activated on mainnet. Bor v2.10.0 became mandatory for all Polygon PoS nodes. ## Critical issue in Heimdall The most severe vulnerability was in the Heimdall client. A specially crafted transaction could force validators to perform excessive processing, potentially disrupting the network. The Kyoto hard fork resolved this issue, requiring Heimdall v0.11.0 for validators and full nodes. Nodes failing to upgrade were left out of consensus. ## Proactive solution approach Polygon fixed the security vulnerabilities before public disclosure. The hard forks were tested in private environments and verified to work smoothly on mainnet. This proactive approach prevented potential network disruptions. Polygon's security team confirmed no exploitation of these flaws occurred. ## Mandatory node upgrades Nodes running older versions past the hard fork activation height fell out of consensus. To rejoin the mainnet, these nodes must upgrade to Bor v2.10.0 or Heimdall v0.11.0. Polygon urged all users to update to the latest versions for uninterrupted network participation. ## Polygon token performance Polygon's native token POL (formerly MATIC) was trading around $0.10 when the vulnerabilities were disclosed. The token showed a 4% decline over the past week but recorded a 44% increase over the past month and 2.3% year-to-date growth. CoinGecko data suggests these fluctuations reflect normal market movements. ## Industry-wide implications Polygon's security updates set an important example for other blockchain projects. Experts emphasize the need for similar security measures, especially in proof-of-stake networks. Industry leaders recommend adopting proactive security approaches to maintain network integrity. ## Conclusions and recommendations Polygon's swift resolution of these security issues demonstrates the maturity of blockchain projects in handling vulnerabilities. Users must keep their nodes updated and follow security announcements closely. This incident underscores the continuous need for improving security standards in the crypto industry. ## Sources covering this story - https://cointelegraph.com/news/polygon-discloses-security-flaws-fixed-in-recent-hard-forks?utm_source=rss_feed&utm_medium=rss&utm_campaign=rss_partner_inbound — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._