---
id: CVE-2026-33814
title: >-
  When processing HTTP/2 SETTINGS frames, transport will enter an infinite loop
  of writing CONTINUATION frames if it receives a SETTINGS_MAX_FRAME_SIZE with a
  value of 0.
summary: >-
  When processing HTTP/2 SETTINGS frames, transport will enter an infinite loop
  of writing CONTINUATION frames if it receives a SETTINGS_MAX_FRAME_SIZE with a
  value of 0.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-835
  - CWE-606
vendor: golang
product: go
affected:
  - go < 1.25.10
  - 'go >= 1.26.0, < 1.26.3'
  - http2 < 0.53.0
patched:
  - go 1.26.3
  - http2 0.53.0
published: '2026-05-07'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T13:17:59.293'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-33814'
references:
  - url: 'https://go.dev/cl/761581'
    label: security@golang.org
  - url: 'https://go.dev/cl/761640'
    label: security@golang.org
  - url: 'https://go.dev/issue/78476'
    label: security@golang.org
  - url: 'https://groups.google.com/g/golang-announce/c/qcCIEXso47M'
    label: security@golang.org
  - url: 'https://pkg.go.dev/vuln/GO-2026-4918'
    label: security@golang.org
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    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2467815'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
  - cve.org
  - osv
  - go
epss: 0.00868
epssPercentile: 0.57009
aliases:
  - GO-2026-4918
  - BIT-golang-2026-33814
ecosystem: go
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-05-08T18:00:53.951676Z'
ingestedAt: '2026-07-02T12:34:40.550Z'
---

## Overview

When processing HTTP/2 SETTINGS frames, transport will enter an infinite loop of writing CONTINUATION frames if it receives a SETTINGS_MAX_FRAME_SIZE with a value of 0.

## Affected

- `go < 1.25.10`
- `go >= 1.26.0, < 1.26.3`
- `http2 < 0.53.0`

## Remediation

Upgrade past the affected range:

- `go 1.26.3`
- `http2 0.53.0`

## Package advisory (CVE-2026-33814)

Affected packages:

- `golang.org/x/net < 0.53.0`
- `stdlib >= 1.26.0-0, < 1.26.3`

Patched in:

- `golang.org/x/net 0.53.0`
- `stdlib 1.26.3`

Source: https://osv.dev/vulnerability/GO-2026-4918