CVE-2026-67857 Memory corruption in n/a
An out-of-bounds read in the open62541 OPC UA client library allows attackers to cause denial of service or disclose sensitive memory contents.
- 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-2026-67857?
CVE-2026-67857 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
open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c.
Weakness: CWE-125
Which versions are affected by CVE-2026-67857?
How do I fix CVE-2026-67857?
No fix has been published for CVE-2026-67857 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-2026-67857 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67857 exists.
Sources
Also known as DEBIAN-CVE-2026-67857, GHSA-2mh5-cmr8-pwvp, UBUNTU-CVE-2026-67857.