# CVE-2026-13326: Qt NFC out-of-bounds read in language code parsing

Source: https://junglewise.ai/threats/cve-2026-13326-qt-nfc-out-of-bounds-read-in-language-code-parsing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-11. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-13326 · Severity: info · Published 2026-09-11

Qt's NFC (Near Field Communication) module contains a vulnerability in how it parses language codes from NFC tags. An attacker with a specially crafted NFC tag can trigger an out-of-bounds memory read, causing the application to crash or potentially leak a small amount of memory. This affects any application using Qt's NFC functionality to read tags.

Vendors: [Qt](https://junglewise.ai/threats/vendors/qt).

## Quick answers

**Is CVE-2026-13326 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-13326 being exploited in the wild.

**How severe is CVE-2026-13326?** Informational severity, published 11 September 2026.

**Which products and versions are affected?** Qt NFC <UNKNOWN>.

**Is there a fix for CVE-2026-13326?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-13326 attacked?** It is attacked with physical access, in a software library.

**Am I affected by CVE-2026-13326?** Check whether you run Qt NFC 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.

## Technical details

An out-of-bounds read vulnerability exists in Qt NFC's language code length parsing logic. The vulnerability is triggered when processing a malformed NFC tag with an incorrectly specified language code length field. The attack requires physical proximity to the NFC reader and a crafted NFC tag. A successful exploit can cause a denial of service (crash) or limited information disclosure through memory disclosure. A patch is available in the Qt project's code review system (codereview.qt-project.org).

## Affected products

- Qt Qt NFC <UNKNOWN>

## Timeline

- 2026-09-11: disclosed

## References

- [https://codereview.qt-project.org/c/qt/qtconnectivity/+/743136](https://codereview.qt-project.org/c/qt/qtconnectivity/+/743136)