CVE-2020-26265

Name: CVE-2020-26265
Creator: NVD / NIST
Published: 2020-12-11T17:15:12.87+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.91%

Last modified Jun 17, 2026

CVE-2020-26265 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 0.91% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.91%

55.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Ethereum	Go Ethereum	>= 1.9.4, < 1.9.20

References

https://github.com/ethereum/go-ethereum/releases/tag/v1.9.20Third Party Advisory
https://github.com/ethereum/go-ethereum/security/advisories/GHSA-xw37-57qp-9mm4Third Party Advisory
https://github.com/ethereum/go-ethereum/releases/tag/v1.9.20Third Party Advisory
https://github.com/ethereum/go-ethereum/security/advisories/GHSA-xw37-57qp-9mm4Third Party Advisory

Timeline

Published: Dec 11, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26265?

How severe is CVE-2020-26265?

CVE-2020-26265 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.91% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26265?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26265?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST