# CVE-2026-107472: Qt out-of-bounds read in QTextCodec TSCII encoding

Source: https://junglewise.ai/threats/cve-2026-107472-an-out-of-bounds-read-vulnerability-in-the-qtextcodec-tscii  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-27. Updated: 2026-10-27  
License: CC BY 4.0 with a link back

CVE-2026-107472 · Severity: info · Published 2026-10-27

Qt is a cross-platform application development framework used to build desktop and mobile applications. An out-of-bounds read vulnerability in the TSCII text encoding conversion feature can cause applications to crash or misinterpret encoded data when processing certain text inputs.

Technologies: [Qt 5](https://junglewise.ai/threats/technologies/qt-5). Vendors: [Qt](https://junglewise.ai/threats/vendors/qt).

## Quick answers

**Is CVE-2026-107472 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-107472 being exploited in the wild.

**How severe is CVE-2026-107472?** Informational severity, published 27 October 2026.

**Which products and versions are affected?** Qt 5 4.0.0 to 6.8.8; 6.9.0 to 6.11.2; Qt 6 6.8.0 to 6.8.8; 6.9.0 to 6.11.2.

**Is there a fix for CVE-2026-107472?** Yes: fixed in Qt 6.8.9, Qt 6.11.3, Qt 6.12.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-107472 attacked?** It is attacked over the network or with local access, in a software library.

**Am I affected by CVE-2026-107472?** Check whether you run Qt 5 or Qt 6 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in Qt 6.8.9, Qt 6.11.3, Qt 6.12.0

## Technical details

An out-of-bounds read in QTextCodec's TSCII encoding implementation allows reading memory outside the input buffer during text encoding operations. The vulnerability affects Qt's text codec layer across multiple versions; exploitation requires that an application use QTextCodec to convert text to TSCII encoding, triggering the out-of-bounds access.

## Affected products

- Qt Qt 5 4.0.0 to 6.8.8; 6.9.0 to 6.11.2
- Qt Qt 6 6.8.0 to 6.8.8; 6.9.0 to 6.11.2

## Timeline

- 2026-10-27: disclosed

## References

- [https://codereview.qt-project.org/c/qt/qt5compat/+/762021](https://codereview.qt-project.org/c/qt/qt5compat/+/762021)
- [https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products](https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products)

## Related threats

- [Qt QXmlSimpleReader uncontrolled recursion in XML parsing](https://junglewise.ai/threats/cve-2026-97845-an-uncontrolled-recursion-vulnerability-has-been-discovered-in)
- [Qt out-of-bounds write in QTextCodec iconv encoding](https://junglewise.ai/threats/cve-2026-107590-an-out-of-bounds-write-vulnerability-in-the-qt-qtextcodec-iconv)