---
id: "CVE-2026-107590"
kind: "vulnerability"
aliases: ["CVE-2026-107590"]
title: "Qt 5: encoding text with QTextCodec can write outside a buffer"
severity: "low"
cvss: 1.9
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["c++", "package", "qt", "qt5"]
not_affected_if: ["qt6"]
published_at: "2026-10-27T13:16:54+00:00"
first_seen_at: "2026-10-27T13:31:51+00:00"
updated_at: "2026-10-27T13:32:23+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107590", "first_seen_at": "2026-10-27T13:31:51+00:00"}]
---

# Qt 5: encoding text with QTextCodec can write outside a buffer

In the Qt 5 Compatibility APIs module, QTextCodec's iconv-based encoding can write past an internal buffer under certain conditions. The sources say this can crash the application and may affect data integrity.

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

## Timeline

- 2026-10-27T13:31:51+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-107590

## From the sources

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.

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