CVE-2026-101201 PUBLISHED

QBinaryJson::fromBinaryData() integer overflow leading to OOB read

Assigner: Qt
Reserved: 28.09.2026 Published: 20.10.2026 Updated: 20.10.2026

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

CVSS Vector: 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
CVSS Score: 4.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	Passive

CVSS 4.0

Vendor	qt
Product	qt
Versions	Default: unaffected affected from 5.0.0 to 6.8.8 (incl.) affected from 6.9.0 to 6.11.2 (incl.)