CVE-2026-101201

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

4.3 MediumFix available

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

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Passive

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.16%Unchanged since Oct 20, 2026

What each source reports

CVE List Score used 4.3

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

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

Record: CVE-2026-101201
CVSS 4.0: 4.3 MediumCVSS: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-190, CWE-125
Updated: 2026-11-02

EUVDEUVD-2026-104838 4.3

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

Record: EUVD-2026-104838
CVSS 4.0: 4.3 MediumCVSS: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
Updated: 2026-11-02

GitHub AdvisoriesGHSA-7cv7-2mxj-57c6 4.3

A malformed header in the binary file fed to QBinaryJson::fromBinaryData() can cause undefined...

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

Record: GHSA-7cv7-2mxj-57c6
CVSS 4.0: 4.3 MediumCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:X/RE:L/U:Amber
Weakness: CWE-125
Updated: 2026-11-02

NVD 4.3

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

Record: CVE-2026-101201
CVSS 4.0: 4.3 MediumCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:X/RE:L/U:Amber
Weakness: CWE-125, CWE-190
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-101201 4.3

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

Record: DEBIAN-CVE-2026-101201
CVSS 4.0: 4.3 MediumCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:X/RE:L/U:Amber
Updated: 2026-11-02

OSVOESA-2026-4484 4.3

qt6-qt5compat security update

Security Fix(es):

A malformed header in the binary file fed to QBinaryJson::fromBinaryData() can cause undefined behaviour because of out-of-bounds read.(CVE-2026-101201)

Record: OESA-2026-4484
CVSS 4.0: 4.3 MediumCVSS: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
Updated: 2026-11-02

OSVOESA-2026-4485 4.3

qt6-qt5compat security update

Security Fix(es):

A malformed header in the binary file fed to QBinaryJson::fromBinaryData() can cause undefined behaviour because of out-of-bounds read.(CVE-2026-101201)

Record: OESA-2026-4485
CVSS 4.0: 4.3 MediumCVSS: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
Updated: 2026-11-02

OSVOESA-2026-4486 4.3

qt6-qt5compat security update

Security Fix(es):

A malformed header in the binary file fed to QBinaryJson::fromBinaryData() can cause undefined behaviour because of out-of-bounds read.(CVE-2026-101201)

Record: OESA-2026-4486
CVSS 4.0: 4.3 MediumCVSS: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
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-101201 4.3

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

Record: UBUNTU-CVE-2026-101201
CVSS 4.0: 4.3 MediumCVSS: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
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`qt6-5compat` Debian:12	All versions, plus listed versions 6.10.2-16.10.2-26.10.2-36.10.2-46.11.2-1 Show 20 moreShow less 6.11.2-26.4.2-16.4.2-26.4.2-36.4.2-46.6.1-16.6.1-26.6.2-16.6.2-26.7.2-16.7.2-26.7.2-36.8.2-16.8.2-26.8.2-36.9.1-16.9.1-26.9.2-16.9.2-26.9.2-3	None known
`qt6-5compat` Debian:13	All versions, plus listed versions 6.10.2-16.10.2-26.10.2-36.10.2-46.11.2-1 Show 7 moreShow less 6.11.2-26.8.2-36.9.1-16.9.1-26.9.2-16.9.2-26.9.2-3	None known
`qt6-5compat` Debian:14	All versions, plus listed versions 6.10.2-16.10.2-26.10.2-36.10.2-46.11.2-1 Show 7 moreShow less 6.11.2-26.8.2-36.9.1-16.9.1-26.9.2-16.9.2-26.9.2-3	None known
`qtbase-opensource-src` Debian:12	All versions, plus listed versions 5.15.10+dfsg-15.15.10+dfsg-25.15.10+dfsg-35.15.10+dfsg-45.15.10+dfsg-5 Show 45 moreShow less 5.15.10+dfsg-65.15.10+dfsg-75.15.10+dfsg-7.15.15.10+dfsg-7.25.15.11+dfsg-15.15.12+dfsg-15.15.12+dfsg-25.15.12+dfsg-35.15.13+dfsg-15.15.13+dfsg-25.15.13+dfsg-35.15.13+dfsg-45.15.14+dfsg-15.15.15+dfsg-15.15.15+dfsg-25.15.15+dfsg-35.15.15+dfsg-45.15.15+dfsg-55.15.15+dfsg-65.15.16+dfsg-15.15.16+dfsg-25.15.17+dfsg-15.15.17+dfsg-25.15.17+dfsg-35.15.17+dfsg-45.15.17+dfsg-55.15.17+dfsg-65.15.17+dfsg-75.15.17+dfsg-85.15.18+dfsg-15.15.18+dfsg-25.15.19+dfsg-15.15.19+dfsg-25.15.19+dfsg-35.15.19+dfsg-45.15.19+dfsg-55.15.19+dfsg-65.15.8+dfsg-115.15.8+dfsg-11+deb12u15.15.8+dfsg-11+deb12u25.15.8+dfsg-11+deb12u35.15.8+dfsg-125.15.8+dfsg-135.15.9+dfsg-15.15.9+dfsg-2	None known
`qtbase-opensource-src` Debian:13	All versions, plus listed versions 5.15.15+dfsg-65.15.15+dfsg-6+deb13u15.15.16+dfsg-15.15.16+dfsg-25.15.17+dfsg-1 Show 15 moreShow less 5.15.17+dfsg-25.15.17+dfsg-35.15.17+dfsg-45.15.17+dfsg-55.15.17+dfsg-65.15.17+dfsg-75.15.17+dfsg-85.15.18+dfsg-15.15.18+dfsg-25.15.19+dfsg-15.15.19+dfsg-25.15.19+dfsg-35.15.19+dfsg-45.15.19+dfsg-55.15.19+dfsg-6	None known
`qtbase-opensource-src` Debian:14	All versions, plus listed versions 5.15.15+dfsg-65.15.16+dfsg-15.15.16+dfsg-25.15.17+dfsg-15.15.17+dfsg-2 Show 14 moreShow less 5.15.17+dfsg-35.15.17+dfsg-45.15.17+dfsg-55.15.17+dfsg-65.15.17+dfsg-75.15.17+dfsg-85.15.18+dfsg-15.15.18+dfsg-25.15.19+dfsg-15.15.19+dfsg-25.15.19+dfsg-35.15.19+dfsg-45.15.19+dfsg-55.15.19+dfsg-6	None known
`qtbase-opensource-src-gles` Debian:12	All versions, plus listed versions 5.15.10+dfsg-15.15.10+dfsg-25.15.10+dfsg-35.15.10+dfsg-45.15.10+dfsg-5 Show 13 moreShow less 5.15.10+dfsg-65.15.12+dfsg-15.15.13+dfsg-15.15.13+dfsg-25.15.15+dfsg-15.15.15+dfsg-25.15.17+dfsg-15.15.17+dfsg-25.15.18+dfsg-15.15.19+dfsg-15.15.19+dfsg-25.15.8+dfsg-35.15.9+dfsg-1	None known
`qtbase-opensource-src-gles` Debian:13	All versions, plus listed versions 5.15.15+dfsg-25.15.17+dfsg-15.15.17+dfsg-25.15.18+dfsg-15.15.19+dfsg-15.15.19+dfsg-2	None known
`qtbase-opensource-src-gles` Debian:14	All versions, plus listed versions 5.15.15+dfsg-25.15.17+dfsg-15.15.17+dfsg-25.15.18+dfsg-15.15.19+dfsg-15.15.19+dfsg-2	None known
`qt6-qt5compat` openEuler:24.03-LTS-SP4	before 6.5.2-3.oe2403sp4	6.5.2-3.oe2403sp4

Show 8 moreShow less

Affected packages
Package	Affected	Fixed
`qt6-qt5compat` openEuler:24.03-LTS-SP1	before 6.5.2-3.oe2403sp1	6.5.2-3.oe2403sp1
`qt6-qt5compat` openEuler:24.03-LTS-SP3	before 6.5.2-3.oe2403sp3	6.5.2-3.oe2403sp3
`qtbase-opensource-src-gles` Ubuntu:16.04:LTS	All versions, plus listed versions 5.4.2+dfsg-2ubuntu95.5.1+dfsg-6ubuntu15.5.1+dfsg-10ubuntu15.5.1+dfsg-13ubuntu15.5.1+dfsg-13ubuntu2 Show 9 moreShow less 5.5.1+dfsg-13ubuntu35.5.1+dfsg-14ubuntu15.5.1+dfsg-14ubuntu25.5.1+dfsg-14ubuntu35.5.1+dfsg-15ubuntu15.5.1+dfsg-16ubuntu15.5.1+dfsg-16ubuntu45.5.1+dfsg-16ubuntu55.5.1+dfsg-16ubuntu6	None known
`qtbase-opensource-src-gles` Ubuntu:20.04:LTS	All versions, plus listed versions 5.12.4+dfsg-1build15.12.5+dfsg-15.12.5+dfsg-25.12.8+dfsg-0ubuntu1	None known
`qtbase-opensource-src-gles` Ubuntu:22.04:LTS	All versions, plus listed versions 5.15.2+dfsg-45.15.2+dfsg-55.15.3+dfsg-1	None known
`qtbase-opensource-src-gles` Ubuntu:24.04:LTS	All versions, plus listed versions 5.15.10+dfsg-25.15.10+dfsg-35.15.12+dfsg-15.15.12+dfsg-1ubuntu15.15.12+dfsg-1ubuntu25.15.13+dfsg-1	None known
`qtbase-opensource-src-gles` Ubuntu:26.10	All versions, plus listed versions 5.15.18+dfsg-15.15.19+dfsg-2	None known
`qtbase-opensource-src-gles` Ubuntu:26.04:LTS	All versions, plus listed versions 5.15.17+dfsg-15.15.17+dfsg-25.15.18+dfsg-1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-101201 is a medium vulnerability (CVSS 4.3) in Qt, published October 20, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.16%, the 5th percentile. Fixed in qt6-qt5compat 6.5.2-3.oe2403sp4.

References

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Left out here: 1 version. The JSON record has them.