CVE-2026-67858 Memory corruption in n/a
An unauthenticated remote attacker can cause a denial of service in open62541 by sending crafted RegisterServer requests when multicast discovery is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-67858?
CVE-2026-67858 is a high-severity memory corruption vulnerability in n/a, published on 4 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-120
Which versions are affected by CVE-2026-67858?
How do I fix CVE-2026-67858?
No fix has been published for CVE-2026-67858 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-67858 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67858 exists.
Sources
Also known as DEBIAN-CVE-2026-67858, GHSA-jh69-g63c-w587, UBUNTU-CVE-2026-67858.