---
cve: "CVE-2025-5991"
severity: "LOW"
cvss: 2.1
epss: "0.1%"
vendor: "Qt"
kev: false
exploited: false
published: "2025-06-11 08:15:22"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-28T08:51:40+02:00"
---

# CVE-2025-5991

> 2.1 LOW

## Beschreibung

There is a "Use After Free" vulnerability in Qt's QHttp2ProtocolHandler in the QtNetwork module. This only affects HTTP/2 handling, HTTP handling is not affected by this at all. This happens due to a race condition between how QHttp2Stream uploads the body of a
 POST request and the simultaneous handling of HTTP error responses.



This issue only affects Qt 6.9.0 and has been fixed for Qt 6.9.1.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## BSI-Hinweise (deutsch)

- [QT: Schwachstelle ermöglicht nicht spezifizierten Angriff](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2025-1311)

## Referenzen

- <https://codereview.qt-project.org/c/qt/qtbase/+/643777>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-5991) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_