CVE-2026-19248 Unbounded recursion vulnerability in the QDomNode destructor of Qt XML impacts Qt
Attackers can cause a denial-of-service crash in applications using Qt XML by sending specially crafted untrusted input.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-19248?
CVE-2026-19248 is a high-severity denial of service vulnerability in qt, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
QDomDocument XML parsing is vulnerable to a remotely-triggerable denial-of-service crash when processing untrusted input.
Weakness: CWE-674
Which versions are affected by CVE-2026-19248?
Linux distribution packages (12)
qt5-qtbase Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
qt5-qtbase-common Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
qt5-qtbase-devel Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
qt5-qtbase-examples Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
qt5-qtbase-gui Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
qt5-qtbase-ibase Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
qt5-qtbase-mysql Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
qt5-qtbase-odbc Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
qt5-qtbase-postgresql Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
qt5-qtbase-private-devel Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
qt5-qtbase-static Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
qt5-qtbase-tds Red Hat:hummingbird:1 | All versions | 0:5.15.18-5.2.hum1 |
How do I fix CVE-2026-19248?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-19248 being exploited?
There is no known exploitation of CVE-2026-19248 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-19248, ECHO-1033-a641-0eec, GHSA-j2w2-j66p-cjg6, OESA-2026-4212, OESA-2026-4344, OESA-2026-4345 and 3 more.