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.

The Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_87082 advisory.

    * 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)

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-87082 advisory.

    - Fix CVE-2026-19248: unbounded recursion and O(N2) behavior in QDom       Resolves: RHEL-261136

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:87082 advisory.

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:84582 advisory.

    Qt is a software toolkit for developing applications.  This package contains base tools, like string, xml,     and network handling.

    Security Fix(es):

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

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-11573)

The version of qt5-qtbase installed on the remote host is prior to 5.15.3-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3951 advisory.

    Uncontrolled recursion in Qt's QDomDocument serialization (QtXml) lets deeply nested untrusted XML crash     the app via stack exhaustion (DoS only). (CVE-2026-11573)

    QDomDocument XML parsing is vulnerable to a remotely-triggerable denial-of-service crash when processing     untrusted input. (CVE-2026-19248)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-11573)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
370315	Rocky Linux 9 [CIQ] Security Update: qt5-qtbase / qt5-qtbase-common / qt5-qtbase-debuginfo / etc Multiple Vulnerabilities (crlsa-2026_87082)	Nessus	Rocky Linux Local Security Checks	Local	high
370310	Oracle Linux 9 : qt5-qtbase (ELSA-2026-87082)	Nessus	Oracle Linux Local Security Checks	Local	high
370134	RHEL 9 : qt5-qtbase (RHSA-2026:87082)	Nessus	Red Hat Local Security Checks	Local	high
367214	RHEL 10 : qt6-qtbase (RHSA-2026:84582)	Nessus	Red Hat Local Security Checks	Local	high
472779	Echo: qtbase-opensource-src: security update to 5.15.15+dfsg-6+e5	Tenable Cloud Security	Echo Local Security Checks	Local	high
472779	Echo: qtbase-opensource-src: security update to 5.15.15+dfsg-6+e5	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
351039	Amazon Linux 2 : qt5-qtbase (ALAS-2026-3951)	Nessus	Amazon Linux Local Security Checks	Local	high
344021	Linux Distros Unpatched Vulnerability : CVE-2026-11573	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-11573

high

Tenable Plugins

high

high

high

high

high

high

high

high