---
cve: "CVE-2026-16762"
severity: "HIGH"
cvss: 8.7
epss: ""
vendor: "Qt"
kev: false
exploited: false
published: "2026-10-23 09:17:06"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-24T05:05:12+02:00"
---

# CVE-2026-16762

> 8.7 HIGH

## Beschreibung

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.

## CNA-Record (Kanon, cvelistV5)

- CNA: **Qt**
- State: PUBLISHED
- Stand: 2026-10-23 10:56:05
- CNA-CVSS: **8.7** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/S:P/AU:Y/R:A/RE:L`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/S:P/AU:Y/R:A/RE:L
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Schwachstellen-Klasse

- **CWE-407** — Inefficient Algorithmic Complexity
  An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

## Referenzen

- <https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-16762:>
- <https://codereview.qt-project.org/c/qt/qtbase/+/738885>
- <https://codereview.qt-project.org/c/qt/qtbase/+/738901>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-16762/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_