CVE-2020-26240: Ethereum Go Ethereum

High severity, CVSS 7.5. EPSS: 1.9% chance of exploitation in the next 30 days.

Go Ethereum, or "Geth", is the official Golang implementation of the Ethereum protocol. An ethash mining DAG generation flaw in Geth before version 1.9.24 could cause miners to erroneously calculate PoW in an upcoming epoch (estimated early January, 2021). This happened on the ETC chain on 2020-11-06. This issue is relevant only for miners, non-mining nodes are unaffected. This issue is fixed as of 1.9.24

Affected products

• Ethereum Go Ethereum: before 1.9.24 (fixed in 1.9.24)

Published 2020-11-25. Last modified 2026-06-17.