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.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26265
Reference (s):
- https://github.com/ethereum/go-ethereum/security/advisories/GHSA-xw37-57qp-9mm4
- URL: https://github.com/ethereum/go-ethereum/security/advisories/GHSA-xw37-57qp-9mm4
- https://github.com/ethereum/go-ethereum/releases/tag/v1.9.20
- URL: https://github.com/ethereum/go-ethereum/releases/tag/v1.9.20