{"id":"CVE-2020-26240","aliases":["EUVD-2021-1406","GHSA-v592-xf75-856p","GO-2022-0775","openSUSE-SU-2025:15424-1"],"status":"published","title":"Erroneous Proof of Work calculation in geth","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","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01863,"percentile":0.79546,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-682"],"published":"2020-11-25T01:25:27Z","modified":"2026-10-20T10:52:55Z","fixes":[{"ecosystem":"Go","package":"github.com/ethereum/go-ethereum","fixed_in":["1.9.24"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/ethereum/go-ethereum","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.24"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/ethereum/go-ethereum","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.9.24"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/ethereum/go-ethereum","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.9.24"}]}]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"govulncheck-vulndb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.20250807T150727-1.1"}]}],"bundled":44}],"products":[{"vendor":"ethereum","product":"go-ethereum"},{"vendor":"ethereum","product":"go_ethereum"}],"references":[{"url":"https://blog.ethereum.org/2020/11/12/geth_security_release/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory"]},{"url":"https://github.com/ethereum/go-ethereum/security/advisories/GHSA-v592-xf75-856p","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://github.com/ethereum/go-ethereum/pull/21793","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/ethereum/go-ethereum/commit/d990df909d7839640143344e79356754384dcdd0","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26240","tags":["advisory"]},{"url":"https://blog.ethereum.org/2020/11/12/geth_security_release","tags":["web"]},{"url":"https://github.com/advisories/GHSA-v592-xf75-856p"},{"url":"https://github.com/ethereum/go-ethereum","tags":["package"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2015-7561","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9962","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-1000056","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-1002102","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-1002100","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-1002101","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-16733","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-19184","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-1002100","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-1002101","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-11245","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-11251","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-11253","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-26240","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-26241","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8551","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8555","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8557","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8558","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8562","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8563","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8566","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-25735","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-25736","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-25737","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-25741","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-25743","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-30465","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-29162","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-29177","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-3162","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-3294","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-2431","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-25809","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-2727","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-2728","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-27561","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-28642","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-5528","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-45310","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-5321","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-3445","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-47907","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-47908","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2020-26240","title":"Erroneous Proof of Work calculation in geth","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","status":"published","published":"2020-11-25T01:25:27Z","modified":"2024-08-04T15:56:04.861Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-682"],"updated_at":"2026-11-02T14:35:46.129376Z"}],"euvd":[{"id":"EUVD-2021-1406","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","status":"published","published":"2020-11-25T01:25:27Z","modified":"2024-08-04T15:56:04Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-03T03:07:14.653267Z"}],"ghsa":[{"id":"GHSA-v592-xf75-856p","title":"Erroneous Proof of Work calculation in geth","description":"### Impact\nAn ethash mining DAG generation flaw in Geth 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.\n\n### Patches\nThis issue is also fixed as of 1.9.24. Thanks to @slavikus for bringing the issue to our attention and writing the fix. \n\n### Workarounds\nThis PR implements a patch: https://github.com/ethereum/go-ethereum/pull/21793 \n\n### References\nhttps://blog.ethereum.org/2020/11/12/geth_security_release/\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [go-ethereum](https://github.com/ethereum/go-ethereum)\n* Email us at [security@ethereum.org](mailto:security@ethereum.org)","status":"published","published":"2021-06-29T21:12:56Z","modified":"2025-01-30T14:39:22Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-682"],"updated_at":"2026-11-02T14:38:28.945236Z"}],"nvd":[{"id":"CVE-2020-26240","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","status":"published","published":"2020-11-25T02:15:10.923Z","modified":"2026-06-17T03:07:53.92Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-682"],"updated_at":"2026-11-02T14:06:25.394006Z"}],"osv":[{"id":"CVE-2020-26240","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","status":"published","published":"2020-11-25T02:15:10.923Z","modified":"2026-10-20T10:52:55.951872892Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:15.879068Z"},{"id":"GHSA-v592-xf75-856p","title":"Erroneous Proof of Work calculation in geth","description":"### Impact\nAn ethash mining DAG generation flaw in Geth 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.\n\n### Patches\nThis issue is also fixed as of 1.9.24. Thanks to @slavikus for bringing the issue to our attention and writing the fix. \n\n### Workarounds\nThis PR implements a patch: https://github.com/ethereum/go-ethereum/pull/21793 \n\n### References\nhttps://blog.ethereum.org/2020/11/12/geth_security_release/\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [go-ethereum](https://github.com/ethereum/go-ethereum)\n* Email us at [security@ethereum.org](mailto:security@ethereum.org)","status":"published","published":"2021-06-29T21:12:56Z","modified":"2026-09-10T03:49:06.349442645Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-682"],"updated_at":"2026-11-02T15:46:56.639206Z"},{"id":"GO-2022-0775","title":"Erroneous Proof of Work calculation in geth in github.com/ethereum/go-ethereum","description":"Erroneous Proof of Work calculation in geth in github.com/ethereum/go-ethereum","status":"published","published":"2024-08-21T15:28:59Z","modified":"2026-03-03T04:50:52.225184Z","updated_at":"2026-11-02T15:47:00.918515Z"},{"id":"openSUSE-SU-2025:15424-1","title":"govulncheck-vulndb-0.0.20250807T150727-1.1 on GA media","description":"These are all security issues fixed in the govulncheck-vulndb-0.0.20250807T150727-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2025-08-08T00:00:00Z","modified":"2026-03-23T04:53:45.821911Z","updated_at":"2026-11-02T16:58:37.810934Z"}]}}