High
Security advisory
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
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-26240
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:07 UTC · Revision 1
Source evidence
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
osv:CVE-2020-26240
Complete source record
{
"id": "47d3db18644c154f3d3a67427d77451f213a19e9313a5efd80cb034f81393372",
"url": "https://osv.dev/vulnerability/CVE-2020-26240",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-26240",
"summary": "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",
"evidence": "osv:CVE-2020-26240",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2020-26240",
"aliases": [
"CVE-2020-26240",
"GHSA-v592-xf75-856p",
"GO-2022-0775"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/ethereum/go-ethereum",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "cc05b050df5f88e80bb26aaf6d2f339c49c2d702"
},
{
"fixed": "d990df909d7839640143344e79356754384dcdd0"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:ethereum:go_ethereum:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.9.24"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "d990df909d7839640143344e79356754384dcdd0"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v1.9.23",
"v1.9.22",
"v1.9.21",
"v1.9.20",
"v1.9.19",
"v1.9.18",
"v1.9.17",
"v1.9.16",
"v1.9.15",
"v1.9.14",
"v1.9.13",
"v1.9.12",
"v1.9.11",
"v1.9.10",
"v1.9.9",
"v1.9.8",
"v1.9.7",
"v1.9.6",
"v1.9.5",
"v1.9.4",
"v1.9.3",
"v1.9.2",
"v1.9.1",
"v1.9.0",
"v1.8.21",
"v1.8.20",
"v1.8.19",
"v1.8.18",
"v1.8.17",
"v1.8.16",
"v1.8.15",
"v1.8.14",
"v1.8.13",
"v1.8.12",
"v1.8.11",
"v1.8.10",
"v1.8.9",
"v1.8.8",
"v1.8.7",
"v1.8.6",
"v1.8.5",
"v1.8.4",
"v1.8.3",
"v1.8.2",
"v1.8.1",
"v1.8.0",
"v1.7.3",
"v1.7.2",
"v1.7.1",
"v1.7.0",
"v1.6.7",
"v1.6.6",
"v1.6.5",
"v1.6.4",
"v1.6.3",
"v1.6.2",
"v1.6.1",
"v1.6.0",
"v1.5.9",
"v1.5.8",
"v1.5.7",
"v1.5.6",
"v1.5.5",
"v1.5.4",
"v1.5.3",
"v1.5.2",
"v1.5.1",
"v1.5.0",
"v1.0.1",
"v0.9.38",
"v0.9.36",
"v0.9.34-1",
"v0.9.34",
"v0.9.32",
"v0.9.30",
"v0.9.28",
"v0.9.26",
"v0.9.25",
"v0.9.24",
"0.9.23",
"v0.9.23",
"v0.9.22",
"v0.9.21",
"v0.9.20",
"v0.9.18",
"v0.9.17",
"0.9.16",
"v0.8.4",
"0.5.19",
"0.5.18",
"0.5.17",
"0.5.16",
"0.5.15",
"0.5.14",
"0.5.13",
"poc5-rc12",
"poc5-rc11",
"2",
"poc5-rc10",
"poc5-rc9",
"poc5-rc8",
"poc5-rc7",
"poc5-rc6",
"poc5-rc4",
"poc5-rc3",
"poc5-rc2",
"poc5-rc1",
"0.3.1",
"0.3.0",
"0.2.2",
"poc1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-26240.json"
}
}
],
"modified": "2026-10-20T10:52:55.951872892Z",
"provider": "osv",
"references": [
"https://blog.ethereum.org/2020/11/12/geth_security_release/",
"https://github.com/ethereum/go-ethereum/security/advisories/GHSA-v592-xf75-856p",
"https://github.com/ethereum/go-ethereum/commit/d990df909d7839640143344e79356754384dcdd0",
"https://github.com/ethereum/go-ethereum/pull/21793"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2020-26240",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 384048,
"published_at": "2020-11-25T02:15:10.923+00:00"
}