# CVE-2026-107157: Out-of-bounds read vulnerability in QCborValue::fromCbor() impacts Qt Framework

Status: published. Published: 2026-10-26. Updated: 2026-11-09.

Specially crafted CBOR input passed to QCborValue::fromCbor() in Qt Core can cause an out-of-bounds read, which may crash the application and could expose information.

## 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/qtbase/+/745719

## Affected products and versions

- qt / Qt: ≥ 0; < 5.12.0 (unaffected, python); ≥ 5.12.0; ≤ 6.8.8 (affected, python); ≥ 6.9.0; ≤ 6.11.1 (affected, python). Source: CNA: Qt; platforms: 64 bit

## Severity and prioritization

- CVSS 4.0: 2 (low); CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/RE:L/U:Amber; source: CNA: Qt

- CISA KEV: No listing in collected sources

- EPSS: 0.15% as of 2026-11-08; percentile 3.91%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-125

## 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-2026-107157: (CNA: Qt; vendor-advisory)

- https://codereview.qt-project.org/c/qt/qtbase/+/745719 (CNA: Qt; patch)

## Provenance

- CNA: Qt: https://www.cve.org/CVERecord?id=CVE-2026-107157; retrieved 2026-11-09; source updated 2026-11-09

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-107157; retrieved 2026-11-09; source updated Not reported

Revision: 1dd81a25017e055ccaf28f872b3c1616ff6a3a5598aba845abb5dd8f5c2118f5

Canonical: https://y2.dev/cve/CVE-2026-107157

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