CVE-2020-26240

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

• CWE-682
• CWE-682

• https://blog.ethereum.org/2020/11/12/geth_security_release/Vendor Advisory
• https://github.com/ethereum/go-ethereum/commit/d990df909d7839640143344e79356754384dcdd0Patch, Third Party Advisory
• https://github.com/ethereum/go-ethereum/pull/21793Patch, Third Party Advisory
• https://github.com/ethereum/go-ethereum/security/advisories/GHSA-v592-xf75-856pThird Party Advisory
• https://blog.ethereum.org/2020/11/12/geth_security_release/Vendor Advisory
• https://github.com/ethereum/go-ethereum/commit/d990df909d7839640143344e79356754384dcdd0Patch, Third Party Advisory
• https://github.com/ethereum/go-ethereum/pull/21793Patch, Third Party Advisory
• https://github.com/ethereum/go-ethereum/security/advisories/GHSA-v592-xf75-856pThird Party Advisory

Published

Nov 25, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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