Quick answers
- Is CVE-2026-95509 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-95509 being exploited in the wild.
- How severe is CVE-2026-95509?
- Informational severity, published 29 September 2026.
- Which products and versions are affected?
- Qt Framework <UNKNOWN>.
- Is there a fix for CVE-2026-95509?
- 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-2026-95509 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-95509?
- Check whether you run Qt Framework 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
Out-of-bounds read vulnerability in QString.arg() formatting function due to incorrect buffer size calculation for Latin-1 optimized strings. The vulnerability is triggered when formatting Latin-1 characters in strings marked for Latin-1 optimization, allowing an attacker to read past allocated memory bounds via crafted string input.
Affected products
- Qt Qt Framework <UNKNOWN>
Timeline
- 2026-09-29: disclosed