Vulnerability record · CVE-2020-26240 · published 25 November 2020

CVE-2020-26240: Go ethereum vulnerability

Ethereum · Go Ethereum

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

7.5 CVSS 3.1 High EPSS 1.9% · top 21.6% CWE-682 · CWE-682

7.5CVSS 3.1 base score, v2 5.0

1.9%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

8References

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Go Ethereum Ethereum

References

Link	Tags
https://blog.ethereum.org/2020/11/12/geth_security_release/	Vendor Advisory
https://github.com/ethereum/go-ethereum/commit/d990df909d7839640143344e79356754384dcdd0	PatchThird Party Advisory
https://github.com/ethereum/go-ethereum/pull/21793	PatchThird Party Advisory
https://github.com/ethereum/go-ethereum/security/advisories/GHSA-v592-xf75-856p	Third Party Advisory
https://blog.ethereum.org/2020/11/12/geth_security_release/	Vendor Advisory
https://github.com/ethereum/go-ethereum/commit/d990df909d7839640143344e79356754384dcdd0	PatchThird Party Advisory
https://github.com/ethereum/go-ethereum/pull/21793	PatchThird Party Advisory
https://github.com/ethereum/go-ethereum/security/advisories/GHSA-v592-xf75-856p	Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-26240), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.