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      Solana's Proof of History Vulnerability Disclosed Ahead of Alpenglow Upgrade

      Researchers from USENIX Security have revealed a vulnerability in Solana's Proof of History (PoH) mechanism, which was initially reported to the Solana development team in December 2025. The vulnerability allows a malicious scheduler leader to manipulate the PoH logical clock through a method known as 're-anchoring.' This manipulation can slow down the advancement of logical time, providing the attacker with an extended window for transaction selection and the ability to isolate honest leader blocks using the TowerBFT fork choice mechanism, with an attacker needing less than 33% of the staking ratio to execute the attack.

      The Alpenglow security competition, which offered a reward of 50,000 SOL, concluded on August 19. However, the vulnerability was not included in the review scope due to competition rules that specify actions must not be triggered when Alpenglow is inactive. The Solana development team has acknowledged the vulnerability and believes that the likelihood of the most severe scenarios occurring under current conditions is low. They anticipate that the upcoming Alpenglow upgrade will fundamentally address the prerequisites for this attack.

      Currently, the Alpenglow code has been integrated into the Agave 4.2 client but has not yet been activated on the mainnet. It is expected to go live with the Agave 4.3 update. Until this upgrade is implemented, the transitional risks associated with the disclosed vulnerability remain unaddressed at the implementation level.

      © 2026 KLEA News. All Rights Reserved. This article is provided for informational purposes only. It is not offered or intended to be used as legal, tax, investment, financial, or other advice.

      Source: KLEA News

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