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Advisory record · GHSA-9856-9gg9-qcmq

Ethereum Contains Consensus Flaw During Block Processing

CVSS 6.5 MediumEPSS 0.013 · 71st percentile

Published by the GitHub Advisory Database at 30 Aug 2021, 16:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/ethereum/go-ethereumGo>=1.10.0, <1.10.81.10.8
Identifiers
GHSA-9856-9gg9-qcmq · CVE-2021-39137 · GO-2022-0254
Weakness (CWE)
CWE-436
Tags
Published
30 Aug 2021
Updated
8 Jul 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Geth (github.com/ethereum/go-ethereum) versions 1.10.0 up to but not including 1.10.8 are affected by a memory-corruption bug in the EVM that can cause nodes to compute different state roots when processing a maliciously crafted transaction, splitting the chain. An attacker can trigger this by submitting such a transaction, and it was exploited on Mainnet at block 13107518. Upgrade to version 1.10.8; no workarounds are listed.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.5 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.013, the 71st percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:05 UTC First seen by agentprime
  2. 31 Oct 2026, 15:05 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.