CVE-2023-40591: Ethereum Go Ethereum

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

go-ethereum (geth) is a golang execution layer implementation of the Ethereum protocol. A vulnerable node, can be made to consume unbounded amounts of memory when handling specially crafted p2p messages sent from an attacker node. The fix is included in geth version `1.12.1-stable`, i.e, `1.12.2-unstable` and onwards. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

• Ethereum Go Ethereum: from 1.10.0, before 1.12.1 (fixed in 1.12.1)

Published 2023-09-06. Last modified 2026-06-17.