---
cve: "CVE-2026-67858"
severity: "HIGH"
cvss: 7.5
epss: "0.5%"
vendor: "n/a"
kev: false
exploited: false
published: "2026-08-04 22:17:16"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-24T07:10:56+02:00"
---

# CVE-2026-67858

> 7.5 HIGH · 🧪 PoC

## Beschreibung

Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This allows remote attackers 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/8094>
- <https://github.com/open62541/open62541/tree/master/examples/discovery>
- <https://github.com/open62541/open62541/blob/master/src/server/ua_services_discovery.c>
- <https://github.com/open62541/open62541/blob/master/src/server/ua_discovery_mdns.c>
- <https://github.com/open62541/open62541/blob/master/doc/building.rst>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-67858) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_