---
id: CVE-2026-107590
title: >-
  Out-of-bounds write vulnerability in QTextCodec iconv-based encoding impacts
  Qt
summary: "An out-of-bounds write vulnerability in the Qt QTextCodec iconv-based encoding of the Qt 5 Compatibility APIs module (Qt Core in Qt 5 and earlier) impacts Qt.\_Under certain conditions, encoding text with QTextCodec may write outside an i…"
severity: low
cvss: 1.9
cvssVector: >-
  CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/R:U/RE:L/U:Green
cvssSource: cna
cwe:
  - CWE-787
  - CWE-131
vendor: qt
product: Qt
affected:
  - Qt >= 4.5.0 <= 6.8.8
  - Qt >= 6.9.0 <= 6.11.2
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T12:24:53.005Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-107590'
references:
  - url: >-
      https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-107590:
  - url: 'https://codereview.qt-project.org/c/qt/qt5compat/+/762752'
tags:
  - cve.org
ingestedAt: '2026-10-27T16:11:59.324Z'
---

## Overview

An out-of-bounds write vulnerability in the Qt QTextCodec iconv-based encoding of the Qt 5 Compatibility APIs module (Qt Core in Qt 5 and earlier) impacts Qt. Under certain conditions, encoding text with QTextCodec may write outside an internal buffer. This can cause the application to crash and may affect data integrity.

## Affected

- `Qt >= 4.5.0 <= 6.8.8`
- `Qt >= 6.9.0 <= 6.11.2`

## Remediation

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