Medium
Security advisory
Go Ethereum, or "Geth", is the official Golang implementation of the Ethereum protocol. In Geth before version 1.9.25 a denial-of-service vulnerability can make a LES server crash via malicious GetProofsV2 request from a connected LES client. This vulnerability only concerns users explicitly enabling les server; disabling les prevents the exploit. The vulnerability was patched in version 1.9.25.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-26264
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:08 UTC · Revision 1
Source evidence
Go Ethereum, or "Geth", is the official Golang implementation of the Ethereum protocol. In Geth before version 1.9.25 a denial-of-service vulnerability can make a LES server crash via malicious GetProofsV2 request from a connected LES client. This vulnerability only concerns users explicitly enabling les server; disabling les prevents the exploit. The vulnerability was patched in version 1.9.25.
osv:CVE-2020-26264
Complete source record
{
"id": "c651422bb81c3ca430651de93c116858f11af3e5436251255bc4a80491c6e074",
"url": "https://osv.dev/vulnerability/CVE-2020-26264",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-26264",
"summary": "Go Ethereum, or \"Geth\", is the official Golang implementation of the Ethereum protocol. In Geth before version 1.9.25 a denial-of-service vulnerability can make a LES server crash via malicious GetProofsV2 request from a connected LES client. This vulnerability only concerns users explicitly enabling les server; disabling les prevents the exploit. The vulnerability was patched in version 1.9.25.",
"evidence": "osv:CVE-2020-26264",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2020-26264",
"aliases": [
"CVE-2020-26264",
"GHSA-r33q-22hv-j29q",
"GO-2021-0063"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/ethereum/go-ethereum",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "e7872729012a4871397307b12cc3f4772ffcbec6"
},
{
"fixed": "bddd103a9f0af27ef533f04e06ea429cf76b6d46"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:ethereum:go_ethereum:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.9.25"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "bddd103a9f0af27ef533f04e06ea429cf76b6d46"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "e7872729012a4871397307b12cc3f4772ffcbec6"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v1.9.25"
}
]
}
}
],
"versions": [
"v1.9.24",
"v1.9.23",
"v1.9.22",
"v1.9.21",
"v1.9.20",
"v1.9.19",
"v1.9.18",
"v1.9.17",
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"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",
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"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-2020-26264.json"
}
}
],
"modified": "2026-10-20T10:52:56.303104966Z",
"provider": "osv",
"references": [
"https://github.com/ethereum/go-ethereum/releases/tag/v1.9.25",
"https://github.com/ethereum/go-ethereum/security/advisories/GHSA-r33q-22hv-j29q",
"https://github.com/ethereum/go-ethereum/commit/bddd103a9f0af27ef533f04e06ea429cf76b6d46",
"https://github.com/ethereum/go-ethereum/pull/21896"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2020-26264",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 384059,
"published_at": "2020-12-11T17:15:12.793+00:00"
}