---
id: CVE-2026-97032
title: >-
  HTTP/2 servers could end up crashing due to inadvertently modifying its HPACK
  encoder concurrently
summary: >-
  HTTP/2 servers could end up crashing due to inadvertently modifying its HPACK
  encoder concurrently. This happens because the server modifies the HPACK
  encoder from two goroutines without synchronization: one uses the encoder to
  encode a …
severity: none
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T23:17:06.213'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97032'
references:
  - url: 'https://go.dev/cl/847188'
    label: security@golang.org
  - url: 'https://go.dev/cl/847313'
    label: security@golang.org
  - url: 'https://go.dev/issue/81867'
    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-2026-6617'
    label: security@golang.org
tags:
  - nvd
ingestedAt: '2026-10-09T00:19:50.981Z'
---

## Overview

HTTP/2 servers could end up crashing due to inadvertently modifying its HPACK encoder concurrently. This happens because the server modifies the HPACK encoder from two goroutines without synchronization: one uses the encoder to encode a HEADERS frame as part of a response sent to a client and the other modifies the encoder's table size when handling a SETTINGS frame containing SETTINGS_HEADER_TABLE_SIZE that a client sends. A malicious client can repeatedly send a request while changing the header table size to crash the server.

## Remediation

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