{"cve":"CVE-2020-26265","nvd":{"published":"2020-12-11T17:15:12.870","modified":"2026-06-17T03:07:57.407","status":"Modified","description":"Go Ethereum, or \"Geth\", is the official Golang implementation of the Ethereum protocol. In Geth from version 1.9.4 and before version 1.9.20 a consensus-vulnerability could cause a chain split, where vulnerable versions refuse to accept the canonical chain. The fix was included in the Paragade release version 1.9.20. No individual workaround patches have been made -- all users are recommended to upgrade to a newer version.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","score":5.3},"cwes":["CWE-682"],"references":["https://github.com/ethereum/go-ethereum/releases/tag/v1.9.20","https://github.com/ethereum/go-ethereum/security/advisories/GHSA-xw37-57qp-9mm4","https://github.com/ethereum/go-ethereum/releases/tag/v1.9.20","https://github.com/ethereum/go-ethereum/security/advisories/GHSA-xw37-57qp-9mm4"],"products":["ethereum:go_ethereum"],"source":"nvd","synced_at":"2026-10-19T21:12:09.559580076+00:00"},"epss":{"cve":"CVE-2020-26265","score":0.0092,"percentile":0.60285,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-xw37-57qp-9mm4","url":"https://osv.dev/vulnerability/GHSA-xw37-57qp-9mm4","summary":"Consensus flaw during block processing in github.com/ethereum/go-ethereum","modified":"2026-09-10T03:49:15.235306786Z","packages":[{"ecosystem":"Go","name":"github.com/ethereum/go-ethereum","purl":"pkg:golang/github.com/ethereum/go-ethereum","ranges":[">=1.9.4 <1.9.20"],"fixed":["1.9.20"]}]},{"id":"GO-2021-0105","url":"https://osv.dev/vulnerability/GO-2021-0105","summary":"Consensus flaw in github.com/ethereum/go-ethereum","modified":"2024-05-20T16:03:47Z","packages":[{"ecosystem":"Go","name":"github.com/ethereum/go-ethereum","purl":"pkg:golang/github.com/ethereum/go-ethereum","ranges":[">=1.9.4 <1.9.20"],"fixed":["1.9.20"]}]}],"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."]}