# CVE-2026-107479: Integer truncation vulnerability in QTextCodec conversion functions impacts Qt Framework

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: Qt) — https://codereview.qt-project.org/c/qt/qt5compat/+/763226

## Affected products and versions

- qt / Qt: ≥ 0; < 5.0.0 (unknown, python); ≥ 5.0.0; ≤ 6.8.8 (affected, python); ≥ 6.9.0; ≤ 6.11.2 (affected, python). Source: CNA: Qt

## Severity and prioritization

- CVSS 4.0: 1.7 (low); CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/RE:L/U:Green; source: CNA: Qt

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-197

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-107479: (CNA: Qt; vendor-advisory)

- https://codereview.qt-project.org/c/qt/qt5compat/+/763226 (CNA: Qt; patch)

## Provenance

- CNA: Qt: https://www.cve.org/CVERecord?id=CVE-2026-107479; retrieved 2026-11-04; source updated 2026-11-04

Revision: 7f116ea4b06f4b201c27861ebccff7e41a01e28844abff9b01e12664fd137a04

Canonical: https://y2.dev/cve/CVE-2026-107479

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