---
cve: "CVE-2026-95509"
severity: "HIGH"
cvss: 8.8
epss: "0.3%"
vendor: "Qt"
kev: false
exploited: false
published: "2026-09-29 11:16:43"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-11-01T00:36:09+01:00"
---

# CVE-2026-95509

> 8.8 HIGH

## Beschreibung

Strings optimized for Latin-1 displaying Latin-1 characters cause incorrect String.arg() formatting by an incorrect buffer size calculation, causing out-of-bounds reading.

## CNA-Record (Kanon, cvelistV5)

- CNA: **Qt**
- State: PUBLISHED
- Stand: 2026-09-29 15:02:15
- CNA-CVSS: **8.8** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N`)

## 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:L/VI:L/VA:H/SC:N/SI:N/SA:N
```

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

## Schwachstellen-Klasse

- **CWE-125** — Out-of-bounds Read
  The product reads data past the end, or before the beginning, of the intended buffer.
- **CWE-131** — Incorrect Calculation of Buffer Size
  The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.

## Angriffsmuster (CAPEC)

- [CAPEC-540 — Overread Buffers](https://capec.mitre.org/data/definitions/540.html) _(Severity: High)_

## BSI-Hinweise (deutsch)

- [QT für MCUs: Mehrere Schwachstellen ermöglichen DoS und Manipulation von Daten](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-3653) — _BSI-Einstufung: mittel_
  Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in QT ausnutzen, um einen Denial of Service Angriff durchzuführen und Daten zu manipulieren.

## Referenzen

- <https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-95509:>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-95509/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_