What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-20
• Weakness: CWE-125

Description

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

Affected products

• Qt: from 5.0.0 through 6.8.8; from 6.9.0 through 6.11.2

References

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

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