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Fencer Vulns
high 7.1

CVE-2026-11573 json

Uncontrolled recursion in QDomDocument/QDomNode serialization causes stack exhaustion (QtXml)

published 2026-09-08 2 mo ago modified 2026-09-11 59 d ago also EUVD-2026-72717

cvss
7.1
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

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.

Patch / fix

  • qt qt 6.8.2
  • qt6-base Debian 14, Debian 13 6.8.2+dfsg-5

debian advisories DEBIAN-CVE-2026-11573

  • qt6-qtbase hummingbird 1 6.11.2-3.hum1
  • qt6-qtbase-gui hummingbird 1 6.11.2-3.hum1
  • qt6-qtbase-odbc hummingbird 1 6.11.2-3.hum1
  • qt6-qtbase-ibase hummingbird 1 6.11.2-3.hum1
  • qt6-qtbase-mysql hummingbird 1 6.11.2-3.hum1
  • qt6-qtbase-common hummingbird 1 6.11.2-3.hum1
  • qt6-qtbase-examples hummingbird 1 6.11.2-3.hum1
  • qt6-qtbase-postgresql hummingbird 1 6.11.2-3.hum1

red hat advisories RHSA-2026:84582RHSA-2026:74653

  • qt5-qtbase AlmaLinux 8 5.15.3-10.el8_10
  • qt5-qtbase-gui AlmaLinux 8 5.15.3-10.el8_10
  • qt5-qtbase-odbc AlmaLinux 8 5.15.3-10.el8_10
  • qt5-qtbase-mysql AlmaLinux 8 5.15.3-10.el8_10
  • qt5-qtbase-common AlmaLinux 8 5.15.3-10.el8_10
  • qt5-qtbase-examples AlmaLinux 8 5.15.3-10.el8_10
  • qt5-qtbase-postgresql AlmaLinux 8 5.15.3-10.el8_10
  • qt5-qtbase AlmaLinux 9 5.15.9-11.el9_8.2

almalinux advisories ALSA-2026:93924ALSA-2026:87082

  • qt5-qtbase Rocky Linux 8 5.15.3-10.el8_10
  • qt5-qtbase Rocky Linux 9 5.15.9-11.el9_8.2

rocky linux advisories RLSA-2026:93924RLSA-2026:87082

  • qtbase Azure Linux 3.0 6.6.3-6

azure linux advisories AZL-100947

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-11573 updated cvss 7.5

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

  • Red Hat Enterprise Linux 7 qt5-qtbase, qt5-qtbase-gui, qt5-rpm-macros, qt5-qtbase-odbc, qt5-qtbase-mysql, qt5-qtbase-common, +2 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 10 qt6-qtbase
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images qt5-qtbase
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) qt5-qtbase-static 5.15.9-11.el9_6.2, qt5-qtbase-debuginfo 5.15.9-11.el9_6.2, qt5-qtbase-debugsource 5.15.9-11.el9_6.2, qt5-qtbase-gui-debuginfo 5.15.9-11.el9_6.2, qt5-qtbase-odbc-debuginfo 5.15.9-11.el9_6.2, qt5-qtbase-devel-debuginfo 5.15.9-11.el9_6.2, +4 more
    fixed: vendor fix RHSA-2026:95575
  • Red Hat Enterprise Linux AppStream (v. 8) qt5-qtbase 5.15.3-10.el8_10, qt5-qtbase-gui 5.15.3-10.el8_10, qt5-qtbase-odbc 5.15.3-10.el8_10, qt5-qtbase-mysql 5.15.3-10.el8_10, qt5-qtbase-common 5.15.3-10.el8_10, qt5-qtbase-examples 5.15.3-10.el8_10, +1 more
    fixed: vendor fix RHSA-2026:93924
  • Red Hat Enterprise Linux AppStream (v. 9) qt5-qtbase 5.15.9-11.el9_8.2, qt5-qtbase-gui 5.15.9-11.el9_8.2, qt5-qtbase-odbc 5.15.9-11.el9_8.2, qt5-qtbase-mysql 5.15.9-11.el9_8.2, qt5-qtbase-common 5.15.9-11.el9_8.2, qt5-qtbase-examples 5.15.9-11.el9_8.2, +1 more
    fixed: vendor fix RHSA-2026:87082
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) qt5-qtbase 5.12.5-9.el8_4.3, qt5-qtbase-gui 5.12.5-9.el8_4.3, qt5-qtbase-odbc 5.12.5-9.el8_4.3, qt5-qtbase-mysql 5.12.5-9.el8_4.3, qt5-qtbase-common 5.12.5-9.el8_4.3, qt5-qtbase-examples 5.12.5-9.el8_4.3, +1 more
    fixed: vendor fix RHSA-2026:96086
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) qt5-qtbase 5.15.2-5.el8_6.2, qt5-qtbase-gui 5.15.2-5.el8_6.2, qt5-qtbase-odbc 5.15.2-5.el8_6.2, qt5-qtbase-mysql 5.15.2-5.el8_6.2, qt5-qtbase-common 5.15.2-5.el8_6.2, qt5-qtbase-examples 5.15.2-5.el8_6.2, +1 more
    fixed: vendor fix RHSA-2026:95619
show 12 more
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) qt5-qtbase 5.15.3-2.el8_8.2, qt5-qtbase-gui 5.15.3-2.el8_8.2, qt5-qtbase-odbc 5.15.3-2.el8_8.2, qt5-qtbase-mysql 5.15.3-2.el8_8.2, qt5-qtbase-common 5.15.3-2.el8_8.2, qt5-qtbase-examples 5.15.3-2.el8_8.2, +1 more
    fixed: vendor fix RHSA-2026:96089
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) qt5-qtbase 5.15.3-2.el9_2.3, qt5-qtbase-gui 5.15.3-2.el9_2.3, qt5-qtbase-odbc 5.15.3-2.el9_2.3, qt5-qtbase-mysql 5.15.3-2.el9_2.3, qt5-qtbase-common 5.15.3-2.el9_2.3, qt5-qtbase-examples 5.15.3-2.el9_2.3, +1 more
    fixed: vendor fix RHSA-2026:95574
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) qt5-qtbase 5.15.9-11.el9_4.2, qt5-qtbase-gui 5.15.9-11.el9_4.2, qt5-qtbase-odbc 5.15.9-11.el9_4.2, qt5-qtbase-mysql 5.15.9-11.el9_4.2, qt5-qtbase-common 5.15.9-11.el9_4.2, qt5-qtbase-examples 5.15.9-11.el9_4.2, +1 more
    fixed: vendor fix RHSA-2026:95588
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) qt6-qtbase 6.8.1-9.el10_0.1, qt6-qtbase-gui 6.8.1-9.el10_0.1, qt6-qtbase-odbc 6.8.1-9.el10_0.1, qt6-qtbase-mysql 6.8.1-9.el10_0.1, qt6-qtbase-common 6.8.1-9.el10_0.1, qt6-qtbase-postgresql 6.8.1-9.el10_0.1
    fixed: vendor fix RHSA-2026:84582
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) qt5-qtbase 5.15.9-11.el9_6.2, qt5-qtbase-gui 5.15.9-11.el9_6.2, qt5-qtbase-odbc 5.15.9-11.el9_6.2, qt5-qtbase-mysql 5.15.9-11.el9_6.2, qt5-qtbase-common 5.15.9-11.el9_6.2, qt5-qtbase-examples 5.15.9-11.el9_6.2, +1 more
    fixed: vendor fix RHSA-2026:95575
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) qt5-qtbase 5.12.5-9.el8_4.3, qt5-qtbase-gui 5.12.5-9.el8_4.3, qt5-qtbase-odbc 5.12.5-9.el8_4.3, qt5-qtbase-mysql 5.12.5-9.el8_4.3, qt5-qtbase-common 5.12.5-9.el8_4.3, qt5-qtbase-examples 5.12.5-9.el8_4.3, +1 more
    fixed: vendor fix RHSA-2026:96086
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) qt5-qtbase 5.15.2-5.el8_6.2, qt5-qtbase-gui 5.15.2-5.el8_6.2, qt5-qtbase-odbc 5.15.2-5.el8_6.2, qt5-qtbase-mysql 5.15.2-5.el8_6.2, qt5-qtbase-common 5.15.2-5.el8_6.2, qt5-qtbase-examples 5.15.2-5.el8_6.2, +1 more
    fixed: vendor fix RHSA-2026:95619
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) qt5-qtbase 5.15.3-2.el8_8.2, qt5-qtbase-gui 5.15.3-2.el8_8.2, qt5-qtbase-odbc 5.15.3-2.el8_8.2, qt5-qtbase-mysql 5.15.3-2.el8_8.2, qt5-qtbase-common 5.15.3-2.el8_8.2, qt5-qtbase-examples 5.15.3-2.el8_8.2, +1 more
    fixed: vendor fix RHSA-2026:96089
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) qt5-qtbase-static 5.15.9-11.el9_8.2, qt5-qtbase-debuginfo 5.15.9-11.el9_8.2, qt5-qtbase-debugsource 5.15.9-11.el9_8.2, qt5-qtbase-gui-debuginfo 5.15.9-11.el9_8.2, qt5-qtbase-odbc-debuginfo 5.15.9-11.el9_8.2, qt5-qtbase-devel-debuginfo 5.15.9-11.el9_8.2, +4 more
    fixed: vendor fix RHSA-2026:87082
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) qt6-qtbase-examples 6.8.1-9.el10_0.1
    fixed: vendor fix RHSA-2026:84582
  • Red Hat Enterprise Linux CRB (v. 8) qt5-qtbase-static 5.15.3-10.el8_10, qt5-qtbase-debuginfo 5.15.3-10.el8_10, qt5-qtbase-debugsource 5.15.3-10.el8_10, qt5-qtbase-gui-debuginfo 5.15.3-10.el8_10, qt5-qtbase-odbc-debuginfo 5.15.3-10.el8_10, qt5-qtbase-devel-debuginfo 5.15.3-10.el8_10, +4 more
    fixed: vendor fix RHSA-2026:93924
  • Red Hat Hardened Images qt6-qtbase 6.11.2-3.hum1, qt6-qtbase-gui 6.11.2-3.hum1, qt6-qtbase-odbc 6.11.2-3.hum1, qt6-qtbase-ibase 6.11.2-3.hum1, qt6-qtbase-mysql 6.11.2-3.hum1, qt6-qtbase-common 6.11.2-3.hum1, +2 more
    fixed: vendor fix RHSA-2026:74653

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 7.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 7.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • qt qt

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.