[ CVE-2026-78253 · Published 23 Sep 2026 ]

Vulnerability in qt

CVSS 2.3 EPSS <1%1 agency advisoryNo fix listed yet

[ Description ]Official description

Uncontrolled recursion in QXmlStreamReader::readElementText() in Qt Group Qt allows attackers to cause a denial of service (application crash via stack exhaustion) via a crafted XML document.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

BSI CERT-Bund23 Sep 2026WID-SEC-2026-3537

QT: Vulnerability allows denial of service Translated from German
CVE-2026-78253

[ References ]References

codereview.qt-project.org/c/qt/qtbase/+/754345

[ Facts ]Key facts

CVE: CVE-2026-78253
EUVD: EUVD-2026-85238
Published: 23 Sep 2026, 12:17 UTC
Updated: 24 Sep 2026, 21:08 UTC
NVD status: Awaiting Analysis
CVSS 4.0: 2.3 Low
CVSS:4.0/AV:N/AC:L/AT:P/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:N/AU:N/R:U/V:X/RE:L/U:Green
Scored by a59d8014-47c4-4630-ab43-e1b13cbe58e3
EPSS: 0.25% chance of exploitation in 30 days · higher than 16% of CVEs
CISA SSVC: Exploitation: none · Automatable: no · Impact: partial
Weakness: CWE-674

[ Affected ]Affected products

qt qt5.0.0 – ≤ 6.8.8, 6.9.0 – ≤ 6.11.1

[ Description ]Official description

[ Fixes ]Fixes and patches

[ Advisories ]Government CERT advisories

QT: Vulnerability allows denial of service Translated from German

[ References ]References