---
cve: "CVE-2026-59691"
severity: "HIGH"
cvss: 7.1
epss: "0.3%"
vendor: "Red Hat"
kev: false
exploited: false
published: "2026-07-09 11:16:41"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T14:51:37+02:00"
---

# CVE-2026-59691

> 7.1 HIGH

## Beschreibung

A heap buffer overflow vulnerability was found in GStreamer's rfbsrc plugin. When a client connects to a malicious RFB/VNC server that advertises a 16bpp framebuffer and sends Hextile-encoded updates, the Hextile background fill path writes 32-bit pixel values into a buffer allocated for 16-bit pixels. This type mismatch causes an out-of-bounds heap write that can lead to denial of service (process crash) and potential memory corruption.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Erforderlich | good |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Hoch | bad |

## Referenzen

- <https://access.redhat.com/errata/RHSA-2026:47179>
- <https://access.redhat.com/errata/RHSA-2026:47180>
- <https://access.redhat.com/errata/RHSA-2026:47731>
- <https://access.redhat.com/errata/RHSA-2026:54658>
- <https://access.redhat.com/errata/RHSA-2026:54659>
- <https://access.redhat.com/errata/RHSA-2026:54660>
- <https://access.redhat.com/errata/RHSA-2026:54664>
- <https://access.redhat.com/errata/RHSA-2026:54665>
- <https://access.redhat.com/errata/RHSA-2026:54752>
- <https://access.redhat.com/errata/RHSA-2026:56658>
- <https://access.redhat.com/errata/RHSA-2026:56772>
- <https://access.redhat.com/errata/RHSA-2026:62532>
- <https://access.redhat.com/security/cve/CVE-2026-59691>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2497343>
- <https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/100>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-59691) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_