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ALSA-2026:87082 — Important: qt5-qtbase security update

Affected: AlmaLinux:9: qt5-qtbase, AlmaLinux:9: qt5-qtbase-common, AlmaLinux:9: qt5-qtbase-devel, AlmaLinux:9: qt5-qtbase-examples, AlmaLinux:9: qt5-qtbase-gui, AlmaLinux:9: qt5-qtbase-mysql, AlmaLinux:9: qt5-qtbase-odbc, AlmaLinux:9: qt5-qtbase-postgresql, AlmaLinux:9: qt5-qtbase-private-devel, AlmaLinux:9: qt5-qtbase-static

Qt is a software toolkit for developing applications. The qt5-base packages contain base tools for string, xml, and network handling in Qt.

Security Fix(es):

* qtbase: qt5-qtbase: qt6-qtbase: qtbase: Denial of Service via uncontrolled recursion in XML serialization (CVE-2026-11573) * qt5-qtbase: qt6-qtbase: Qt: Denial of Service vulnerability in XML parsing (CVE-2026-19248)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

fkie_cve-2026-11573

Uncontrolled recursion (CWE-674) in the QDomDocument/QDomNode serialization path of the Qt XML module (QtXml, qtbase). QDomElementPrivate::save() and QDomNodePrivate::save() recurse mutually, consuming one stack frame per level of element nesting with no depth limit, no configurable bound and no error return. A document with deeply nested elements parses successfully but exhausts the call stack and terminates the process when serialized. Reachable via QDomDocument::toByteArray() (Qt 4.0 and later), QDomDocument::toString(), QDomDocument::toCString(), QDomNode::save(), and operator<<(QTextStream&, const QDomNode&). Denial of service only — no code execution and no memory disclosure.

GHSA-m72v-p257-4w4p

Uncontrolled recursion in Qt's QDomDocument serialization (QtXml) lets deeply nested untrusted XML crash the app via stack exhaustion (DoS only).

msrc_CVE-2026-11573 — Uncontrolled recursion in QDomDocument/QDomNode serialization causes stack exhaustion (QtXml)

msrc_CVE-2026-11573

OESA-2026-4495 — qt6-qtbase security update

Affected: openEuler:24.03-LTS-SP4: qt6-qtbase

Qt is a software toolkit for developing applications. Security Fix(es):

RHSA-2026:74653 — Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

qtbase: qt5-qtbase: qt6-qtbase: qtbase: Denial of Service via uncontrolled recursion in XML serialization

RHSA-2026:87082 — security update for qt5-qtbase

security update for qt5-qtbase

UBUNTU-CVE-2026-11573

Affected: Ubuntu:Pro:16.04:LTS: qtbase-opensource-src, Ubuntu:Pro:18.04:LTS: qtbase-opensource-src, Ubuntu:Pro:20.04:LTS: qtbase-opensource-src, Ubuntu:22.04:LTS: qt6-base, Ubuntu:Pro:22.04:LTS: qtbase-opensource-src, Ubuntu:24.04:LTS: qt6-base, Ubuntu:Pro:24.04:LTS: qtbase-opensource-src, Ubuntu:26.10: qtbase-opensource-src, Ubuntu:26.04:LTS: qtbase-opensource-src