Vulnerability · Published Nov 2, 2026 · Assigned by Qt
CVE-2026-100140Integer overflow vulnerability in XML parsing functionality of Qt5Compat impacts Qt
Low 1.9
In plain English
A low-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)1.9Low
Exploit odds (30 days)0.2%top 94.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An integer overflow vulnerability in the Qt XML parsing (Qt5Compat / QXmlSimpleReader) functionality of Qt.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | qt6-5compat | no fix listed | DEBIAN-CVE-2026-100140 |
| Debian:13 | qt6-5compat | no fix listed | DEBIAN-CVE-2026-100140 |
| Debian:14 | qt6-5compat | no fix listed | DEBIAN-CVE-2026-100140 |
| Ubuntu:22.04:LTS | qt6-5compat | no fix listed | UBUNTU-CVE-2026-100140 |
| Ubuntu:24.04:LTS | qt6-5compat | no fix listed | UBUNTU-CVE-2026-100140 |
| Ubuntu:26.04:LTS | qt6-5compat | no fix listed | UBUNTU-CVE-2026-100140 |
| Ubuntu:26.10 | qt6-5compat | no fix listed | UBUNTU-CVE-2026-100140 |
Affected products (as reported)
Weakness: CWE-190 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/R:U/U:Green
References
- https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-100140: vendor-advisory
- https://codereview.qt-project.org/c/qt/qt5compat/+/768900 patch
- https://codereview.qt-project.org/c/qt/qt5compat/+/764751 patch
- https://codereview.qt-project.org/c/qt/qt5compat/+/768901 patch
- https://codereview.qt-project.org/c/qt/qt5compat/+/768902 patch