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Vulnerability · Published Oct 20, 2026 · Assigned by Qt

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

Medium 4.3

In plain English

A medium-severity integer overflow in qt from qt. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).

Severity (CVSS 4.0)4.3Medium
Exploit odds (30 days)0.2%top 94.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12qt6-5compatno fix listedDEBIAN-CVE-2026-101201
Debian:13qt6-5compatno fix listedDEBIAN-CVE-2026-101201
Debian:14qt6-5compatno fix listedDEBIAN-CVE-2026-101201
Debian:12qtbase-opensource-srcno fix listedDEBIAN-CVE-2026-101201
Debian:13qtbase-opensource-srcno fix listedDEBIAN-CVE-2026-101201
Debian:14qtbase-opensource-srcno fix listedDEBIAN-CVE-2026-101201
Debian:12qtbase-opensource-src-glesno fix listedDEBIAN-CVE-2026-101201
Debian:13qtbase-opensource-src-glesno fix listedDEBIAN-CVE-2026-101201
Debian:14qtbase-opensource-src-glesno fix listedDEBIAN-CVE-2026-101201
Ubuntu:22.04:LTSqtbase-opensource-src-glesno fix listedUBUNTU-CVE-2026-101201
Ubuntu:24.04:LTSqtbase-opensource-src-glesno fix listedUBUNTU-CVE-2026-101201
Ubuntu:26.04:LTSqtbase-opensource-src-glesno fix listedUBUNTU-CVE-2026-101201
Ubuntu:26.10qtbase-opensource-src-glesno fix listedUBUNTU-CVE-2026-101201

Affected products (as reported)

VendorProductVersions
qt qt 5.0.0 – through 6.8.86.9.0 – through 6.11.2

Weakness: CWE-190, CWE-125 · 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

References