CVE-2026-78253

Denial-of-service (stack-exhaustion) vulnerability in QXmlStreamReader::readElementText() impacts Qt

2.3 LowFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Passive

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.43%Up 0.2 points since Sep 24, 2026

What each source reports

CVE List Score used 2.3

Denial-of-service (stack-exhaustion) vulnerability in QXmlStreamReader::readElementText() impacts Qt

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.

Record: CVE-2026-78253
CVSS 4.0: 2.3 LowCVSS: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/S:N/AU:N/R:U/RE:L/U:Green
Weakness: CWE-674
Updated: 2026-11-02

EUVDEUVD-2026-85238 2.3

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.

Record: EUVD-2026-85238
CVSS 4.0: 2.3 LowCVSS: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/S:N/AU:N/R:U/RE:L/U:Green
Updated: 2026-11-02

GitHub AdvisoriesGHSA-cpqc-q57w-7c2q 2.3

Uncontrolled recursion in QXmlStreamReader::readElementText() in Qt Group Qt allows attackers to...

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.

Record: GHSA-cpqc-q57w-7c2q
CVSS 4.0: 2.3 LowCVSS: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
Weakness: CWE-674
Updated: 2026-11-02

NVD 2.3

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.

Record: CVE-2026-78253
CVSS 4.0: 2.3 LowCVSS: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
Weakness: CWE-674
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-78253 2.3

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.

Record: DEBIAN-CVE-2026-78253
CVSS 4.0: 2.3 LowCVSS: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
Updated: 2026-11-02

OSVRHSA-2026:59393 6.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record: RHSA-2026:59393
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-78253 2.3

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.

Record: UBUNTU-CVE-2026-78253
CVSS 4.0: 2.3 LowCVSS: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/S:N/AU:N/R:U/RE:L/U:Green
Updated: 2026-11-02

OSVAZL-106827 No score

CVE-2026-78253 affecting package qtbase for versions less than 6.6.3-7

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.

Record: AZL-106827
Updated: 2026-11-07

OSVopenSUSE-SU-2026:12071-1 No score

AusweisApp-2.6.0-1.1 on GA media

These are all security issues fixed in the AusweisApp-2.6.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2026:12071-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`qtbase` Azure Linux:3	before 6.6.3-7	6.6.3-7
`qt6-base` Debian:12	All versions, plus listed versions 6.10.2+dfsg-16.10.2+dfsg-106.10.2+dfsg-10+hurd.16.10.2+dfsg-116.10.2+dfsg-12 Show 45 moreShow less 6.10.2+dfsg-136.10.2+dfsg-146.10.2+dfsg-156.10.2+dfsg-166.10.2+dfsg-26.10.2+dfsg-36.10.2+dfsg-46.10.2+dfsg-56.10.2+dfsg-66.10.2+dfsg-76.10.2+dfsg-7+hurd.16.10.2+dfsg-86.10.2+dfsg-96.11.2+dfsg-16.11.2+dfsg-26.11.2+dfsg-36.11.2+dfsg-46.11.2+dfsg-56.11.2+dfsg-5+sparc646.11.2+dfsg-66.11.2+dfsg-76.4.2+dfsg-106.4.2+dfsg-116.4.2+dfsg-11~bpo11+16.4.2+dfsg-126.4.2+dfsg-136.4.2+dfsg-146.4.2+dfsg-156.4.2+dfsg-166.4.2+dfsg-176.4.2+dfsg-186.4.2+dfsg-18+loong646.4.2+dfsg-196.4.2+dfsg-206.4.2+dfsg-216.4.2+dfsg-21.16.6.0+dfsg-16.6.0+dfsg-26.6.0+dfsg-36.6.0+dfsg-46.6.0+dfsg-56.6.0+dfsg-66.6.1+dfsg-16.6.1+dfsg-26.6.1+dfsg-3	None known
`qt6-base` Debian:13	All versions, plus listed versions 6.10.2+dfsg-16.10.2+dfsg-106.10.2+dfsg-10+hurd.16.10.2+dfsg-116.10.2+dfsg-12 Show 35 moreShow less 6.10.2+dfsg-136.10.2+dfsg-146.10.2+dfsg-156.10.2+dfsg-166.10.2+dfsg-26.10.2+dfsg-36.10.2+dfsg-46.10.2+dfsg-56.10.2+dfsg-66.10.2+dfsg-76.10.2+dfsg-7+hurd.16.10.2+dfsg-86.10.2+dfsg-96.11.2+dfsg-16.11.2+dfsg-26.11.2+dfsg-36.11.2+dfsg-46.11.2+dfsg-56.11.2+dfsg-5+sparc646.11.2+dfsg-66.11.2+dfsg-76.8.2+dfsg-106.8.2+dfsg-10.16.8.2+dfsg-96.8.2+dfsg-9+deb13u16.8.2+dfsg-9+deb13u26.9.1+dfsg-16.9.1+dfsg-26.9.1+dfsg-36.9.1+dfsg-46.9.1+dfsg-56.9.2+dfsg-16.9.2+dfsg-26.9.2+dfsg-36.9.2+dfsg-4	None known
`qt6-base` Debian:14	before 6.11.2+dfsg-5, plus listed versions 6.10.2+dfsg-16.10.2+dfsg-106.10.2+dfsg-10+hurd.16.10.2+dfsg-116.10.2+dfsg-12 Show 29 moreShow less 6.10.2+dfsg-136.10.2+dfsg-146.10.2+dfsg-156.10.2+dfsg-166.10.2+dfsg-26.10.2+dfsg-36.10.2+dfsg-46.10.2+dfsg-56.10.2+dfsg-66.10.2+dfsg-76.10.2+dfsg-7+hurd.16.10.2+dfsg-86.10.2+dfsg-96.11.2+dfsg-16.11.2+dfsg-26.11.2+dfsg-36.11.2+dfsg-46.8.2+dfsg-106.8.2+dfsg-10.16.8.2+dfsg-96.9.1+dfsg-16.9.1+dfsg-26.9.1+dfsg-36.9.1+dfsg-46.9.1+dfsg-56.9.2+dfsg-16.9.2+dfsg-26.9.2+dfsg-36.9.2+dfsg-4	6.11.2+dfsg-5
`qtbase-opensource-src` Debian:12	All versions, plus listed versions 5.15.10+dfsg-15.15.10+dfsg-25.15.10+dfsg-35.15.10+dfsg-45.15.10+dfsg-5 Show 45 moreShow less 5.15.10+dfsg-65.15.10+dfsg-75.15.10+dfsg-7.15.15.10+dfsg-7.25.15.11+dfsg-15.15.12+dfsg-15.15.12+dfsg-25.15.12+dfsg-35.15.13+dfsg-15.15.13+dfsg-25.15.13+dfsg-35.15.13+dfsg-45.15.14+dfsg-15.15.15+dfsg-15.15.15+dfsg-25.15.15+dfsg-35.15.15+dfsg-45.15.15+dfsg-55.15.15+dfsg-65.15.16+dfsg-15.15.16+dfsg-25.15.17+dfsg-15.15.17+dfsg-25.15.17+dfsg-35.15.17+dfsg-45.15.17+dfsg-55.15.17+dfsg-65.15.17+dfsg-75.15.17+dfsg-85.15.18+dfsg-15.15.18+dfsg-25.15.19+dfsg-15.15.19+dfsg-25.15.19+dfsg-35.15.19+dfsg-45.15.19+dfsg-55.15.19+dfsg-65.15.8+dfsg-115.15.8+dfsg-11+deb12u15.15.8+dfsg-11+deb12u25.15.8+dfsg-11+deb12u35.15.8+dfsg-125.15.8+dfsg-135.15.9+dfsg-15.15.9+dfsg-2	None known
`qtbase-opensource-src` Debian:13	All versions, plus listed versions 5.15.15+dfsg-65.15.15+dfsg-6+deb13u15.15.16+dfsg-15.15.16+dfsg-25.15.17+dfsg-1 Show 15 moreShow less 5.15.17+dfsg-25.15.17+dfsg-35.15.17+dfsg-45.15.17+dfsg-55.15.17+dfsg-65.15.17+dfsg-75.15.17+dfsg-85.15.18+dfsg-15.15.18+dfsg-25.15.19+dfsg-15.15.19+dfsg-25.15.19+dfsg-35.15.19+dfsg-45.15.19+dfsg-55.15.19+dfsg-6	None known
`qtbase-opensource-src` Debian:14	before 5.15.19+dfsg-6, plus listed versions 5.15.15+dfsg-65.15.16+dfsg-15.15.16+dfsg-25.15.17+dfsg-15.15.17+dfsg-2 Show 13 moreShow less 5.15.17+dfsg-35.15.17+dfsg-45.15.17+dfsg-55.15.17+dfsg-65.15.17+dfsg-75.15.17+dfsg-85.15.18+dfsg-15.15.18+dfsg-25.15.19+dfsg-15.15.19+dfsg-25.15.19+dfsg-35.15.19+dfsg-45.15.19+dfsg-5	5.15.19+dfsg-6
`qt6-qtbase` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:6.11.2-2.hum1	0:6.11.2-2.hum1
`qt6-qtbase-common` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:6.11.2-2.hum1	0:6.11.2-2.hum1
`qt6-qtbase-devel` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:6.11.2-2.hum1	0:6.11.2-2.hum1

Show 20 moreShow less

Affected packages
Package	Affected	Fixed
`qt6-qtbase-examples` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:6.11.2-2.hum1	0:6.11.2-2.hum1
`qt6-qtbase-gui` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:6.11.2-2.hum1	0:6.11.2-2.hum1
`qt6-qtbase-ibase` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:6.11.2-2.hum1	0:6.11.2-2.hum1
`qt6-qtbase-mysql` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:6.11.2-2.hum1	0:6.11.2-2.hum1
`qt6-qtbase-odbc` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:6.11.2-2.hum1	0:6.11.2-2.hum1
`qt6-qtbase-postgresql` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:6.11.2-2.hum1	0:6.11.2-2.hum1
`qt6-qtbase-private-devel` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:6.11.2-2.hum1	0:6.11.2-2.hum1
`qt6-qtbase-static` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:6.11.2-2.hum1	0:6.11.2-2.hum1
`qtbase-opensource-src` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 5.4.2+dfsg-2ubuntu95.5.1+dfsg-6ubuntu45.5.1+dfsg-10ubuntu25.5.1+dfsg-13ubuntu15.5.1+dfsg-13ubuntu2 Show 15 moreShow less 5.5.1+dfsg-13ubuntu35.5.1+dfsg-14ubuntu15.5.1+dfsg-14ubuntu25.5.1+dfsg-14ubuntu35.5.1+dfsg-15ubuntu15.5.1+dfsg-16ubuntu15.5.1+dfsg-16ubuntu65.5.1+dfsg-16ubuntu75.5.1+dfsg-16ubuntu7.15.5.1+dfsg-16ubuntu7.25.5.1+dfsg-16ubuntu7.55.5.1+dfsg-16ubuntu7.65.5.1+dfsg-16ubuntu7.75.5.1+dfsg-16ubuntu7.7+esm15.5.1+dfsg-16ubuntu7.7+esm2	None known
`qtbase-opensource-src` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 5.9.1+dfsg-10ubuntu15.9.1+dfsg-10ubuntu25.9.2+dfsg-4ubuntu65.9.3+dfsg-0ubuntu15.9.3+dfsg-0ubuntu3 Show 12 moreShow less 5.9.3+dfsg-0ubuntu45.9.4+dfsg-0ubuntu35.9.4+dfsg-0ubuntu45.9.5+dfsg-0ubuntu15.9.5+dfsg-0ubuntu25.9.5+dfsg-0ubuntu2.15.9.5+dfsg-0ubuntu2.35.9.5+dfsg-0ubuntu2.45.9.5+dfsg-0ubuntu2.55.9.5+dfsg-0ubuntu2.65.9.5+dfsg-0ubuntu2.6+esm15.9.5+dfsg-0ubuntu2.6+esm2	None known
`qtbase-opensource-src` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 5.12.4+dfsg-4ubuntu15.12.5+dfsg-25.12.5+dfsg-85.12.5+dfsg-8build15.12.5+dfsg-9build1 Show 6 moreShow less 5.12.8+dfsg-0ubuntu15.12.8+dfsg-0ubuntu2.15.12.8+dfsg-0ubuntu2.1+esm15.12.8+dfsg-0ubuntu2.1+esm25.12.8+dfsg-0ubuntu2.1+esm35.12.8+dfsg-0ubuntu2.1+esm4	None known
`qt6-base` Ubuntu:22.04:LTS	All versions, plus listed versions 6.2.2+dfsg-5ubuntu16.2.2+dfsg-6ubuntu16.2.2+dfsg-6ubuntu26.2.4+dfsg-1ubuntu16.2.4+dfsg-2ubuntu16.2.4+dfsg-2ubuntu1.1	None known
`qtbase-opensource-src` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 5.15.2+dfsg-125.15.2+dfsg-135.15.2+dfsg-145.15.2+dfsg-14ubuntu15.15.2+dfsg-14ubuntu3 Show 8 moreShow less 5.15.2+dfsg-155.15.3+dfsg-15.15.3+dfsg-25.15.3+dfsg-2ubuntu0.15.15.3+dfsg-2ubuntu0.25.15.3+dfsg-2ubuntu0.2+esm15.15.3+dfsg-2ubuntu0.2+esm25.15.3+dfsg-2ubuntu0.2+esm3	None known
`qt6-base` Ubuntu:24.04:LTS	All versions, plus listed versions 6.4.2+dfsg-186.4.2+dfsg-196.4.2+dfsg-19build16.4.2+dfsg-206.4.2+dfsg-216.4.2+dfsg-21.1build46.4.2+dfsg-21.1build5	None known
`qtbase-opensource-src` Ubuntu:Pro:24.04:LTS	All versions, plus listed versions 5.15.10+dfsg-35.15.10+dfsg-55.15.10+dfsg-5ubuntu15.15.12+dfsg-1ubuntu15.15.12+dfsg-3ubuntu1 Show 4 moreShow less 5.15.12+dfsg-3ubuntu65.15.12+dfsg-3ubuntu75.15.13+dfsg-1ubuntu15.15.13+dfsg-1ubuntu1+esm1	None known
`qt6-base` Ubuntu:26.10	All versions, plus listed versions 6.10.2+dfsg-76.10.2+dfsg-14ubuntu26.10.2+dfsg-156.10.2+dfsg-166.11.2+dfsg-4ubuntu2	None known
`qtbase-opensource-src` Ubuntu:26.10	All versions, plus listed versions 5.15.18+dfsg-1ubuntu15.15.19+dfsg-2ubuntu15.15.19+dfsg-2ubuntu2	None known
`qt6-base` Ubuntu:26.04:LTS	All versions, plus listed versions 6.9.2+dfsg-1ubuntu16.9.2+dfsg-26.9.2+dfsg-3ubuntu16.9.2+dfsg-3ubuntu26.9.2+dfsg-46.10.2+dfsg-36.10.2+dfsg-66.10.2+dfsg-7	None known
`qtbase-opensource-src` Ubuntu:26.04:LTS	All versions, plus listed versions 5.15.17+dfsg-1ubuntu15.15.17+dfsg-1ubuntu25.15.18+dfsg-1ubuntu1	None known
`AusweisApp` openSUSE:Tumbleweed From an advisory covering 2 CVEs	before 2.6.0-1.1	2.6.0-1.1

History

History
Recorded	Changed	Sources
Nov 7, 2026	affected	OSV
Nov 6, 2026	affected
Nov 5, 2026	facts	OSV
Nov 2, 2026	affected, aliases, references
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-78253 is a low vulnerability (CVSS 2.3) in Qt, published September 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.43%, the 37th percentile. Fixed in qtbase 6.6.3-7.

References

Show 13 moreShow less

This page doesn't list everything

Left out here: 44 versions. The JSON record has them.