An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption dur…
CVE-2026-16762 · GHSA-3gxv-qxph-7hg3 · EUVD-2026-108655 · published 23 Oct 2026
How serious is it
- Severity: high, CVSS score 8.7 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-16762?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- The Qt Company Qt: 4.3.0 <6.8.9
- The Qt Company Qt: 6.9.0 <6.11.2
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption during parsing, making the application unresponsive (denial of service). Exploitation requires only that the application parse attacker-influenced XML; no authentication, privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality or integrity — no data disclosure, data modification, or code execution — and the impact is contained to the affected process.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-16762:
- codereview.qt-project.org/c/qt/qtbase/+/738885
- codereview.qt-project.org/c/qt/qtbase/+/738901
Merged from ENISA EUVD. Last updated 23 Oct 2026. All vulnerabilities · RSS · JSON