---
cve: "CVE-2026-76781"
severity: "MEDIUM"
cvss: 5.5
epss: "0.2%"
vendor: "Red Hat"
kev: false
exploited: false
published: "2026-09-17 16:17:42"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-24T21:45:50+02:00"
---

# CVE-2026-76781

> 5.5 MEDIUM

## Beschreibung

A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of Service (DoS).

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- c6324894 (Commit)

## Referenzen

- <https://access.redhat.com/errata/RHSA-2026:57604>
- <https://access.redhat.com/security/cve/CVE-2026-76781>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2519776>
- <https://gitlab.gnome.org/GNOME/libxml2/-/commit/c6324894>
- <https://gitlab.gnome.org/GNOME/libxml2/-/merge_requests/442>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-76781) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_