---
id: CVE-2023-51714
title: >-
  An issue was discovered in the HTTP2 implementation in Qt before 5.15.17, 6.x
  before 6.2.11, 6.3.x through 6.5.x before 6.5.4, and 6.6.x before 6.6.2
summary: >-
  An issue was discovered in the HTTP2 implementation in Qt before 5.15.17, 6.x
  before 6.2.11, 6.3.x through 6.5.x before 6.5.4, and 6.6.x before 6.6.2.
  network/access/http2/hpacktable.cpp has an incorrect HPack integer overflow
  check.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-190
vendor: qt
product: qt
affected:
  - debian_linux = 10.0
  - 'qt >= 5.7, < 5.15.17'
  - 'qt >= 6.0.0, < 6.2.11'
  - 'qt >= 6.3.0, < 6.5.4'
  - 'qt >= 6.6.0, < 6.6.2'
patched:
  - qt 6.6.2
published: '2023-12-24'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T22:17:25.630'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-51714'
references:
  - url: 'https://codereview.qt-project.org/c/qt/qtbase/+/524864'
    label: cve@mitre.org
  - url: 'https://codereview.qt-project.org/c/qt/qtbase/+/524865/3'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2024/04/msg00027.html'
    label: cve@mitre.org
  - url: 'https://codereview.qt-project.org/c/qt/qtbase/+/524864'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://codereview.qt-project.org/c/qt/qtbase/+/524865/3'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/04/msg00027.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00978
epssPercentile: 0.61028
ingestedAt: '2026-10-08T23:16:47.354Z'
---

## Overview

An issue was discovered in the HTTP2 implementation in Qt before 5.15.17, 6.x before 6.2.11, 6.3.x through 6.5.x before 6.5.4, and 6.6.x before 6.6.2. network/access/http2/hpacktable.cpp has an incorrect HPack integer overflow check.

## Affected

- `debian_linux = 10.0`
- `qt >= 5.7, < 5.15.17`
- `qt >= 6.0.0, < 6.2.11`
- `qt >= 6.3.0, < 6.5.4`
- `qt >= 6.6.0, < 6.6.2`

## Remediation

Upgrade past the affected range:

- `qt 6.6.2`