Summary
Go Ethereum affected by DoS via malicious p2p message
Credit
This issue was reported to the Ethereum Foundation Bug Bounty Program by Waleed Ahmed from vulsight.com
Impact
A vulnerable node can be forced to shutdown/crash using a specially crafted message.
More details to be released later.
The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths. Typical impact: varies by context: data corruption, logic bypass, or denial of service.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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The problem is resolved in the v1.16.9 and v1.17.0 releases of Geth.
Frequently Asked Questions
- What is CVE-2026-26314? CVE-2026-26314 is a high-severity improper input validation vulnerability in github.com/ethereum/go-ethereum (go), affecting versions <= 1.16.8. It is fixed in 1.16.9. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.
- Which versions of github.com/ethereum/go-ethereum are affected by CVE-2026-26314? github.com/ethereum/go-ethereum (go) versions <= 1.16.8 is affected.
- Is there a fix for CVE-2026-26314? Yes. CVE-2026-26314 is fixed in 1.16.9. Upgrade to this version or later.
- Is CVE-2026-26314 exploitable, and should I be worried? Whether CVE-2026-26314 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-26314 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-26314? Upgrade
github.com/ethereum/go-ethereumto 1.16.9 or later.