Integer overflow vulnerability in XML parsing functionality of Qt5Compat impacts Qt
Affects Qt 6.0 through 6.8.9, 6.9.0 through 6.11.2, and 6.12.0 when an application parses specially crafted XML with the Qt5Compat XML parser. CVSS rates it Low (1.9). Fixed in Qt 6.8.10, 6.11.3, and 6.12.1.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in Qt 6.8.10, Qt 6.11.3, Qt 6.12.1
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Affected Qt versions: from Qt 6.0 to Qt 6.8.9, from Qt 6.9.0 to Qt 6.11.2, and Qt 6.12.0 The application must process a specially crafted XML document in the Qt5Compat XML parser
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 7/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Fix
- Fixed in Qt 6.8.10, Qt 6.11.3, Qt 6.12.1
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
The Qt framework's XML parsing component, which is part of the Qt5Compat module, contains an integer overflow flaw that can be triggered when processing XML input. Successful exploitation could potentially lead to unexpected application behavior, such as crashes or memory-related errors.
Read the original description
An integer overflow vulnerability in the Qt XML parsing (Qt5Compat / QXmlSimpleReader) functionality of Qt.
What to do
Check whether your setup matches what the bug needs.
Affected Qt versions: from Qt 6.0 to Qt 6.8.9, from Qt 6.9.0 to Qt 6.11.2, and Qt 6.12.0 The application must process a specially crafted XML document in the Qt5Compat XML parserUpgrade to a fixed version: Qt 6.8.10, Qt 6.11.3, Qt 6.12.1.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- qt qt
From 6.0.0 · through 6.8.9; From 6.9.0 · through 6.11.2
Evidence 5
- Advisory
- Patch
- Patch
- Patch
- Patch
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-100140
What does this mean?
An integer overflow in the Qt5Compat XML parser can corrupt internal memory handling when a specially crafted XML document is processed. In the worst case this can crash the application or corrupt data.Source: wiki.qt.io
Am I affected, and how do I check?
Qt 6.0 to 6.8.9, 6.9.0 to 6.11.2, and 6.12.0 are listed as affected. The issue needs an application that processes XML through the Qt5Compat XML parser, so check your Qt version and whether that module is in use.Source: wiki.qt.io
What should I do about it?
Upgrade to Qt 6.8.10, Qt 6.11.3, or Qt 6.12.1, matching your release line. No workaround is listed in the checked facts.Source: wiki.qt.io
Is it being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data