{"cve":"CVE-2020-26240","nvd":{"published":"2020-11-25T02:15:10.923","modified":"2026-06-17T03:07:53.920","status":"Modified","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","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-682"],"references":["https://blog.ethereum.org/2020/11/12/geth_security_release/","https://github.com/ethereum/go-ethereum/commit/d990df909d7839640143344e79356754384dcdd0","https://github.com/ethereum/go-ethereum/pull/21793","https://github.com/ethereum/go-ethereum/security/advisories/GHSA-v592-xf75-856p","https://blog.ethereum.org/2020/11/12/geth_security_release/"],"products":["ethereum:go_ethereum"],"source":"nvd","synced_at":"2026-10-19T21:11:20.317016139+00:00"},"epss":{"cve":"CVE-2020-26240","score":0.01863,"percentile":0.79268,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-v592-xf75-856p","url":"https://osv.dev/vulnerability/GHSA-v592-xf75-856p","summary":"Erroneous Proof of Work calculation in geth","modified":"2026-09-10T03:49:06.349442645Z","packages":[{"ecosystem":"Go","name":"github.com/ethereum/go-ethereum","purl":"pkg:golang/github.com/ethereum/go-ethereum","ranges":["<1.9.24"],"fixed":["1.9.24"]}]},{"id":"GO-2022-0775","url":"https://osv.dev/vulnerability/GO-2022-0775","summary":"Erroneous Proof of Work calculation in geth in github.com/ethereum/go-ethereum","modified":"2026-03-03T04:50:52.225184Z","packages":[{"ecosystem":"Go","name":"github.com/ethereum/go-ethereum","purl":"pkg:golang/github.com/ethereum/go-ethereum","ranges":["<1.9.24"],"fixed":["1.9.24"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}