---
id: "CVE-2026-107479"
kind: "vulnerability"
aliases: ["CVE-2026-107479"]
title: "Qt 5: integer truncation in QTextCodec conversion can crash applications"
severity: "low"
cvss: 1.7
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["c++", "package", "qt", "qt5"]
not_affected_if: ["no-qt5", "qtextcodec-unused"]
published_at: "2026-11-04T13:17:21+00:00"
first_seen_at: "2026-11-04T13:27:00+00:00"
updated_at: "2026-11-04T13:28:15+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107479", "first_seen_at": "2026-11-04T13:27:00+00:00"}]
---

# Qt 5: integer truncation in QTextCodec conversion can crash applications

The QTextCodec conversion functions in the Qt 5 Core Compatibility APIs have an integer truncation flaw. An application that uses this functionality can crash.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check whether the application links against Qt 5 Core Compatibility APIs and calls QTextCodec conversion functions.
- Confirm the installed Qt 5 version with `qmake --version` or the Qt package manager.

## Timeline

- 2026-11-04T13:27:00+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-107479

## From the sources

An integer truncation vulnerability in the QTextCodec conversion functions of the Qt 5 Core Compatibility APIs module impacts the Qt Framework. An application using the affected functionality could crash.

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