---
cve: "CVE-2026-18784"
severity: "MEDIUM"
cvss: 4.8
epss: "12%"
vendor: "o6"
kev: false
exploited: false
published: "2026-08-04 17:16:48"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T01:53:11+02:00"
---

# CVE-2026-18784

> 4.8 MEDIUM · 🧪 PoC

## Beschreibung

A vulnerability was found in o6 open62541 up to 1.5.5. This issue affects the function UA_Client_readNodeClassAttribute of the file src/client/ua_client_highlevel.c. Performing a manipulation results in heap-based buffer overflow. Attacking locally is a requirement. The exploit has been made public and could be used. The project closed the issue report, stating that this is not the official way to report a security vulnerability.

## CVSS-Vektor

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

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

## Referenzen

- <https://vuldb.com/vuln/385786>
- <https://vuldb.com/vuln/385786/cti>
- <https://vuldb.com/cve/CVE-2026-18784>
- <https://vuldb.com/submit/857012>
- <https://github.com/open62541/open62541/issues/8139>
- <https://github.com/gff-cw/information/issues/11>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-18784) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_