---
cve: "CVE-2026-67863"
severity: "HIGH"
cvss: 7.5
epss: "0.4%"
vendor: "n/a"
kev: false
exploited: false
published: "2026-08-05 23:16:53"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T18:28:16+02:00"
---

# CVE-2026-67863

> 7.5 HIGH · 🧪 PoC

## Beschreibung

In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path. The issue occurs when UA_Subscription_localPublish continues to use the current UA_Notification after a callback invokes UA_Server_deleteMonitoredItem for the current local MonitoredItem. This allows a remote attacker to cause a denial of service.

## CVSS-Vektor

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

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

## Referenzen

- <https://github.com/open62541/open62541/issues/8131>
- <https://github.com/open62541/open62541/blob/v1.5.5/include/open62541/server.h>
- <https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_subscription.c>
- <https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_services_monitoreditem.c>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-67863) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_