CVE-2020-26265

Consensus flaw during block processing

MEDIUM
5.3
CVSS Score
Published: December 11, 2020 at 04:45 PM UTC
Updated: June 17, 2026 at 03:07 AM UTC
1 product affected across 1 vendorGo Ethereum

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.9%

Description

Go Ethereum, or "Geth", is the official Golang implementation of the Ethereum protocol. In Geth from version 1.9.4 and before version 1.9.20 a consensus-vulnerability could cause a chain split, where vulnerable versions refuse to accept the canonical chain. The fix was included in the Paragade release version 1.9.20. No individual workaround patches have been made -- all users are recommended to upgrade to a newer version.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.9.201.9.4 ≤ v < 1.9.20
Affected range stops below 1.9.20, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

CVSS

5.3MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-682

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