CVSS 3.1
7.1 highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:LCVE-2020-26241
High (7.1) in ethereum go ethereum. EPSS 1.2% chance of exploitation in the next 30 days. Fixed in github.com/ethereum/go-ethereum 1.9.17.
Go Ethereum, or "Geth", is the official Golang implementation of the Ethereum protocol. This is a Consensus vulnerability in Geth before version 1.9.17 which can be used to cause a chain-split where vulnerable nodes reject the canonical chain. Geth's pre-compiled dataCopy (at 0x00...04) contract did a shallow copy on invocation. An attacker could deploy a contract that writes X to an EVM memory region R, then calls 0x00..04 with R as an argument, then overwrites R to Y, and finally invokes the RETURNDATACOPY opcode. When this contract is invoked, a consensus-compliant node would push X on the EVM stack, whereas Geth would push Y. This is fixed in version 1.9.17.
Severity
- EPSS
- 1.2% chance of exploitation in the next 30 days; higher than 68% of CVEs (scores of 2026-10-31)
- CWE
- CWE-682
- Published
- Modified
- Record from
- the NVD, synced
Affected
- ethereum:go_ethereum
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-69v6-xc2j-r2jf | Go | github.com/ethereum/go-ethereum | >=1.9.7 <1.9.17 | 1.9.17 |
| GO-2022-0771 | Go | github.com/ethereum/go-ethereum | >=1.9.7 <1.9.17 | 1.9.17 |