Quick answers
- Is CVE-2026-100140 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-100140 being exploited in the wild.
- How severe is CVE-2026-100140?
- Informational severity, published 2 November 2026.
- Which products and versions are affected?
- Qt5compat <UNKNOWN>.
- Is there a fix for CVE-2026-100140?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-100140 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-100140?
- Check whether you run Qt5compat at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An integer overflow vulnerability exists in the QXmlSimpleReader XML parser component of Qt5Compat. The flaw occurs during XML parsing when handling malformed or oversized XML inputs, allowing an integer overflow to occur. An attacker can exploit this by providing crafted XML input to an application that uses Qt's XML parsing functionality, potentially leading to application crash or undefined behavior.
Affected products
- Qt Qt5Compat <UNKNOWN>