---
id: CVE-2026-78669
title: >-
  A malicious HTTP/2 peer can cause excessive CPU consumption in the client or
  server by opening a large number of streams and then sending many small
  SETTINGS frames containing SETTINGS_INITIAL_WINDOW_SIZE values.
summary: >-
  A malicious HTTP/2 peer can cause excessive CPU consumption in the client or
  server by opening a large number of streams and then sending many small
  SETTINGS frames containing SETTINGS_INITIAL_WINDOW_SIZE values.
severity: none
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T23:17:04.010'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78669'
references:
  - url: 'https://go.dev/cl/847186'
    label: security@golang.org
  - url: 'https://go.dev/cl/847308'
    label: security@golang.org
  - url: 'https://go.dev/issue/81742'
    label: security@golang.org
  - url: 'https://groups.google.com/g/golang-announce/c/U2fTuyDJznI'
    label: security@golang.org
  - url: 'https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBs'
    label: security@golang.org
  - url: 'https://pkg.go.dev/vuln/GO-2026-6611'
    label: security@golang.org
tags:
  - nvd
ingestedAt: '2026-10-09T00:19:50.976Z'
---

## Overview

A malicious HTTP/2 peer can cause excessive CPU consumption in the client or server by opening a large number of streams and then sending many small SETTINGS frames containing SETTINGS_INITIAL_WINDOW_SIZE values.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.