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EUVD-2026-46021

fkie_cve-2020-26241

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.

GHSA-69v6-xc2j-r2jf — Shallow copy bug in geth

Affected: Go: github.com/ethereum/go-ethereum

### 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)

gsd-2020-26241

openSUSE-SU-2025:15424-1 — govulncheck-vulndb-0.0.20250807T150727-1.1 on GA media

govulncheck-vulndb-0.0.20250807T150727-1.1 on GA media