CVE-2020-26241 – github.com/ethereum/go-ethereum

Package

Manager: go
Name: github.com/ethereum/go-ethereum
Vulnerable Version: >=1.9.7 <1.9.17

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N

EPSS: 0.00208 pctl0.43285

Details

Shallow copy bug in geth ### Impact This is a Consensus vulnerability, 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`, - calls `0x00..04` with `R` as an argument, - 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`. ### Patches No standalone patches have been made. ### Workarounds Upgrade to `1.9.17` or higher. ### References https://blog.ethereum.org/2020/11/12/geth_security_release/ ### For more information If you have any questions or comments about this advisory: * Open an issue in [go-ethereum](https://github.com/ethereum/go-ethereum) * Email us at [security@ethereum.org](mailto:security@ethereum.org)

Metadata

Created: 2021-06-29T21:13:01Z
Modified: 2025-01-30T14:37:49Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/06/GHSA-69v6-xc2j-r2jf/GHSA-69v6-xc2j-r2jf.json
CWE IDs: ["CWE-682"]
Alternative ID: GHSA-69v6-xc2j-r2jf
Finding: F138
Auto approve: 1