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TI-2020-16062 Aliases CVE-2020-26241GHSA-69v6-xc2j-r2jf

Shallow copy bug in geth

Priority LOW 34CWE-682Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

EPSS 0.01226 69th percentileScored 2026-11-07
Fix Fixed go-ethereum (ethereum): 1.9.17github.com/ethereum/go-ethereum (Go): 1.9.17

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
ethereumgo-ethereum1.9.7 to before 1.9.171.9.17Patch availableCNA
—github.com/ethereum/go-ethereum (Go)1.9.7 to before 1.9.171.9.17Patch availableGHSA-69v6-xc2j-r2jf
  • go-ethereum Vendorethereum Affected 1.9.7 to before 1.9.17 Fixed in 1.9.17 Patch available CNA
  • github.com/ethereum/go-ethereum (Go) Vendor— Affected 1.9.7 to before 1.9.17 Fixed in 1.9.17 Patch available GHSA-69v6-xc2j-r2jf

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:ethereum:go_ethereum:*:*:*:*:*:*:*:*before 1.9.17Vulnerableethereum
  • cpe:2.3:a:ethereum:go_ethereum:*:*:*:*:*:*:*:* Versions before 1.9.17 Vulnerable ·ethereum

Remediation

  • Fix · CNA go-ethereum (ethereum) Fixed in 1.9.17
  • Fix · GHSA-69v6-xc2j-r2jf github.com/ethereum/go-ethereum (Go) Fixed in 1.9.17 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-26241
  2. 2026-10-03 Alias added: GHSA-69v6-xc2j-r2jf

References

Advisory 3

Other 3

  • TI-2023-22561 Geth (aka go-ethereum) through 1.13.4, when --http --graphql is used, allows remote… CVSS 3.1HIGH 7.5
  • TI-2026-21270 Go Ethereum affected by DoS via malicious p2p message CVSS 4.0HIGH 8.7
  • TI-2023-21389 Denial of service via malicious p2p message in go-ethereum CVSS 3.1HIGH 7.5
  • TI-2018-08612 The GetBlockHeadersMsg handler in the LES protocol implementation in Go Ethereum (aka… CVSS 3.0HIGH 7.5
  • TI-2026-21271 Go Ethereum Improperly Validates the ECIES Public Key in RLPx Handshake CVSS 4.0MEDIUM 6.9
  • TI-2026-21269 Go Ethereum affected by DoS via malicious p2p message CVSS 4.0MEDIUM 6.9
See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences