Incorrect calculation in go-ethereum - CVE-2020-26240
Published: November 24, 2020 / Updated: April 27, 2026
Vulnerability identifier: #VU127996
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-26240
CWE-ID: CWE-682
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
go-ethereum
go-ethereum
Software vendor:
Ethereum
Ethereum
Description
The vulnerability allows a local user to cause miners to create invalid proof-of-work.
The vulnerability exists due to incorrect DAG generation logic in the ethash mining DAG generation functionality when generating DAG data for an upcoming epoch. A local user can trigger mining with the erroneous DAG to cause miners to create invalid proof-of-work.
Only mining nodes are affected; non-mining nodes are unaffected.
Remediation
Install security update from vendor's website.