Medium 4.3Published Oct 20, 2026

CVE-2026-101201QBinaryJson::fromBinaryData() integer overflow leading to OOB read

Updated under an hour ago (2026-10-22 05:50 UTC)

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It affects qt and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

A malformed header in the binary file fed to QBinaryJson::fromBinaryData() can cause undefined behaviour because of out-of-bounds read.

CVSS: 4.3 MEDIUM (v4.0, CNA)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:Amber
Weakness (CWE): CWE-190, CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Qt
NVD analysis: Awaiting Analysis
Record last updated: Oct 20, 2026
First seen by InfoSec Signals: Oct 20, 2026

Affected products

Affected products

qt qt qt:qt	from 5.0.0 through 6.8.8; from 6.9.0 through 6.11.2	CNA record
qt qt qt:qt5compat	from 5.0.0 through 6.8.8; from 6.9.0 through 6.11.2	CNA record
qt qt qt:qtbase	from 5.0.0 through 6.8.8; from 6.9.0 through 6.11.2	CNA record

References

https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-101201vendor-advisory
https://codereview.qt-project.org/c/qt/qt5compat/+/758925patch
https://codereview.qt-project.org/c/qt/qt5compat/+/759230patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.