Quick answers
- Is CVE-2026-78253 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-78253 being exploited in the wild.
- How severe is CVE-2026-78253?
- Informational severity, published 23 September 2026.
- Which products and versions are affected?
- Qt Group Qt <UNKNOWN>.
- Is there a fix for CVE-2026-78253?
- 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-2026-78253 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-78253?
- Check whether you run Qt Group Qt 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
Uncontrolled recursion in QXmlStreamReader::readElementText() allows stack exhaustion when processing deeply nested XML structures. An attacker can exploit this by sending a crafted XML document to any application using the vulnerable Qt XML parsing API. The attack requires no authentication or user interaction beyond the application processing the malicious XML input; successful exploitation crashes the affected application.
Affected products
- Qt Group Qt <UNKNOWN>
Timeline
- 2026-09-23: disclosed