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Not in CISA KEV
HIGH severity

CVE-2018-12018 — go-ethereum

HIGHFix: ethereum/go-ethereum@a5237a2

CVE-2018-12018 is a high-severity (CVSS 7.5) CWE-129 vulnerability in github.com/ethereum/go-ethereum. 3 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for github.com/ethereum/go-ethereum — see the affected versions and patch details below.

Go Ethereum LES protocol implementation vulnerable to Denial of Service

Also known asGHSA-p5gc-957x-gfw9GO-2021-0075
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
3 known
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
4.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs91th percentile — riskier than 91% of all scored CVEsHighest risk
1.88%6.10%10.3%14.5%12.2%4.3%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐹github.com/ethereum/go-ethereum

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

The GetBlockHeadersMsg handler in the LES protocol implementation in Go Ethereum (aka geth) before 1.8.11 may lead to an access violation because of an integer signedness error for the array index, which allows attackers to launch a Denial of Service attack by sending a packet with a -1 query.Skip value. The vulnerable remote node would be crashed by such an attack immediately, aka the EPoD (Ethereum Packet of Death) issue.

Specific Go Packages Affected

github.com/ethereum/go-ethereum/les

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/ethereum/go-ethereumall versions1.8.11go get github.com/ethereum/go-ethereum@v1.8.11

Affected Products

1 product · 1 configurations
Application
go ethereumethereum
< 1.8.11
range
Exploits & PoCs
3

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

The GetBlockHeadersMsg handler in the LES protocol implementation in Go …

peckshield.comNVDSep 2018

Report on github.com

github.comGithubOct 2018

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/ethereum/go-ethereum, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/ethereum/go-ethereum to 1.8.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-12018 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

The GetBlockHeadersMsg handler in the LES protocol implementation in Go Ethereum (aka geth) before 1.8.11 may lead to an access violation because of an integer signedness error for the array index, which allows attackers to launch a Denial of Service attack by sending a packet with a -1 query.Skip value. The vulnerable remote node would be crashed by such an attack immediately, aka the EPoD (Ethereum Packet of Death) issue. ### Specific Go Packages Affected github.com/ethereum/go-ethereum/les
O3 Security · Impact-Aware SCA

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CVE-2018-12018: go-ethereum DoS — Fixed in 1.8.11