Ethereum rose 6% on October 27, 2025, reaching an intraday high of $4,254 as traders rotated into higher-volatility assets. The advance extended ETH's recovery from $3,711 on October 22, with analysts noting a bull flag formation similar to patterns observed in 2020.

Bitcoin Core disclosed four low-severity security vulnerabilities on October 24, 2025, all resolved in version 30.0 released October 10, 2025. The flaws include CPU resource exhaustion from unconfirmed transaction processing, potential crashes on 32-bit systems, and disk space exploitation through spoofed connections and invalid block submissions.