CVE-2020-26240

Erroneous Proof of Work calculation in geth

HIGH
7.5
CVSS Score
Published: November 25, 2020 at 01:25 AM UTC
Updated: June 17, 2026 at 03:07 AM UTC
1 product affected across 1 vendorGo Ethereum

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.9.24
Affected range stops below 1.9.24, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-682

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