CVE-2026-26313 Go Ethereum affected by DoS via malicious p2p message

What is CVE-2026-26313?

CVE-2026-26313 is a medium-severity denial of service vulnerability in go-ethereum, published on 19 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

go-ethereum (geth) is a golang execution layer implementation of the Ethereum protocol. Prior to version 1.17.0, an attacker can cause high memory usage by sending a specially-crafted p2p message. The issue is resolved in the v1.17.0 release.

Weakness: CWE-770

Which versions are affected by CVE-2026-26313?

3 open source packages ship an affected version, including github.com/ethereum/go-ethereum. It affects 1 product.

Products include Ethereum Go Ethereum.

How do I fix CVE-2026-26313?

Upgrade github.com/ethereum/go-ethereum to 1.17.0 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-26313 being exploited?

There is no known exploitation of CVE-2026-26313 in the wild and no public exploit code.

Other vulnerabilities in go-ethereum

• CVE-2026-26314 Go Ethereum affected by DoS via malicious p2p message High 8.7
• CVE-2023-42319 go-ethereum vulnerable to denial of service via crafted GraphQL query High 7.5
• CVE-2023-40591 Denial of service via malicious p2p message in go-ethereum High 7.5
• CVE-2021-42219 Denial of service in go-ethereum High 7.5
• CVE-2022-23327 Denial of Service in Go-Ethereum High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-689v-6xwf-5jf3, GO-2026-4508.